diff --git a/ext/gstmoodbar/gstfastspectrum.cpp b/ext/gstmoodbar/gstfastspectrum.cpp
index 01f03576a..0cc121056 100644
--- a/ext/gstmoodbar/gstfastspectrum.cpp
+++ b/ext/gstmoodbar/gstfastspectrum.cpp
@@ -22,6 +22,7 @@
 #include <QtGlobal>
 
 #include <cstring>
+#include <cmath>
 
 #include <glib.h>
 
@@ -74,7 +75,7 @@ static void gst_fastspectrum_class_init (GstFastSpectrumClass * klass) {
   GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
   GstBaseTransformClass *trans_class = GST_BASE_TRANSFORM_CLASS (klass);
   GstAudioFilterClass *filter_class = GST_AUDIO_FILTER_CLASS (klass);
-  GstCaps *caps;
+  GstCaps *caps = nullptr;
 
   gobject_class->set_property = gst_fastspectrum_set_property;
   gobject_class->get_property = gst_fastspectrum_get_property;
@@ -264,7 +265,7 @@ static void input_data_mixed_float(const guint8* _in, double* out, guint len, do
 
   Q_UNUSED(max_value);
 
-  guint j, ip = 0;
+  guint j = 0, ip = 0;
   const gfloat *in = reinterpret_cast<const gfloat*>(_in);
 
   for (j = 0; j < len; j++) {
@@ -278,7 +279,7 @@ static void input_data_mixed_double (const guint8 * _in, double* out, guint len,
 
   Q_UNUSED(max_value);
 
-  guint j, ip = 0;
+  guint j = 0, ip = 0;
   const gdouble *in = reinterpret_cast<const gdouble*>(_in);
 
   for (j = 0; j < len; j++) {
@@ -290,7 +291,7 @@ static void input_data_mixed_double (const guint8 * _in, double* out, guint len,
 
 static void input_data_mixed_int32_max (const guint8 * _in, double* out, guint len, double max_value, guint op, guint nfft) {
 
-  guint j, ip = 0;
+  guint j = 0, ip = 0;
   const gint32 *in = reinterpret_cast<const gint32*>(_in);
 
   for (j = 0; j < len; j++) {
@@ -302,7 +303,7 @@ static void input_data_mixed_int32_max (const guint8 * _in, double* out, guint l
 
 static void input_data_mixed_int24_max (const guint8 * _in, double* out, guint len, double max_value, guint op, guint nfft) {
 
-  guint j;
+  guint j = 0;
 
   for (j = 0; j < len; j++) {
 #if G_BYTE_ORDER == G_BIG_ENDIAN
@@ -322,7 +323,7 @@ static void input_data_mixed_int24_max (const guint8 * _in, double* out, guint l
 
 static void input_data_mixed_int16_max (const guint8 * _in, double * out, guint len, double max_value, guint op, guint nfft) {
 
-  guint j, ip = 0;
+  guint j = 0, ip = 0;
   const gint16 *in = reinterpret_cast<const gint16*>(_in);
 
   for (j = 0; j < len; j++) {
@@ -369,7 +370,7 @@ static gboolean gst_fastspectrum_setup (GstAudioFilter * base, const GstAudioInf
 
 static void gst_fastspectrum_run_fft (GstFastSpectrum * spectrum, guint input_pos) {
 
-  guint i;
+  guint i = 0;
   guint bands = spectrum->bands;
   guint nfft = 2 * bands - 2;
 
@@ -379,7 +380,7 @@ static void gst_fastspectrum_run_fft (GstFastSpectrum * spectrum, guint input_po
   // Should be safe to execute the same plan multiple times in parallel.
   fftw_execute(spectrum->plan);
 
-  gdouble val;
+  gdouble val = 0.0;
   /* Calculate magnitude in db */
   for (i = 0; i < bands; i++) {
     val = spectrum->fft_output[i][0] * spectrum->fft_output[i][0];
@@ -399,13 +400,13 @@ static GstFlowReturn gst_fastspectrum_transform_ip (GstBaseTransform *trans, Gst
   double max_value = (1UL << ((bps << 3) - 1)) - 1;
   guint bands = spectrum->bands;
   guint nfft = 2 * bands - 2;
-  guint input_pos;
+  guint input_pos = 0;
   GstMapInfo map;
-  const guint8 *data;
-  gsize size;
-  guint fft_todo, msg_todo, block_size;
-  gboolean have_full_interval;
-  GstFastSpectrumInputData input_data;
+  const guint8 *data = nullptr;
+  gsize size = 0;
+  guint fft_todo = 0, msg_todo = 0, block_size = 0;
+  gboolean have_full_interval = false;
+  GstFastSpectrumInputData input_data = nullptr;
 
   g_mutex_lock (&spectrum->lock);
   gst_buffer_map (buffer, &map, GST_MAP_READ);
diff --git a/ext/libstrawberry-common/core/logging.cpp b/ext/libstrawberry-common/core/logging.cpp
index 36570d4cf..1eb88454f 100644
--- a/ext/libstrawberry-common/core/logging.cpp
+++ b/ext/libstrawberry-common/core/logging.cpp
@@ -278,7 +278,7 @@ QString CXXDemangle(const QString &mangled_function);
 
 QString CXXDemangle(const QString &mangled_function) {
 
-  int status;
+  int status = 0;
   char* demangled_function = abi::__cxa_demangle(mangled_function.toLatin1().constData(), nullptr, nullptr, &status);
   if (status == 0) {
     QString ret = QString::fromLatin1(demangled_function);
diff --git a/src/analyzer/analyzerbase.cpp b/src/analyzer/analyzerbase.cpp
index 769a756aa..b29ff63d8 100644
--- a/src/analyzer/analyzerbase.cpp
+++ b/src/analyzer/analyzerbase.cpp
@@ -141,7 +141,7 @@ int Analyzer::Base::resizeExponent(int exp) {
 
 int Analyzer::Base::resizeForBands(int bands) {
 
-  int exp;
+  int exp = 0;
   if (bands <= 8)
     exp = 4;
   else if (bands <= 16)
diff --git a/src/analyzer/blockanalyzer.cpp b/src/analyzer/blockanalyzer.cpp
index bddc3bde0..74f589795 100644
--- a/src/analyzer/blockanalyzer.cpp
+++ b/src/analyzer/blockanalyzer.cpp
@@ -164,7 +164,7 @@ void BlockAnalyzer::analyze(QPainter &p, const Analyzer::Scope &s, bool new_fram
   // Paint the background
   canvas_painter.drawPixmap(0, 0, background_);
 
-  for (int y, x = 0; x < static_cast<int>(scope_.size()); ++x) {
+  for (int x = 0, y = 0; x < static_cast<int>(scope_.size()); ++x) {
     // determine y
     for (y = 0; scope_[x] < yscale_[y]; ++y) continue;
 
@@ -242,7 +242,7 @@ QColor ensureContrast(const QColor &bg, const QColor &fg, int amount) {
    public:
     explicit OutputOnExit(const QColor &color) : c(color) {}
     ~OutputOnExit() {
-      int h, s, v;
+      int h = 0, s = 0, v = 0;
       c.getHsv(&h, &s, &v);
     }
 
@@ -252,8 +252,8 @@ QColor ensureContrast(const QColor &bg, const QColor &fg, int amount) {
 
   OutputOnExit allocateOnTheStack(fg);
 
-  int bh, bs, bv;
-  int fh, fs, fv;
+  int bh = 0, bs = 0, bv = 0;
+  int fh = 0, fs = 0, fv = 0;
 
   bg.getHsv(&bh, &bs, &bv);
   fg.getHsv(&fh, &fs, &fv);
@@ -347,7 +347,7 @@ void BlockAnalyzer::paletteChange(const QPalette&) {
 
     // make a complimentary fadebar colour
     // TODO dark is not always correct, dumbo!
-    int h, s, v;
+    int h = 0, s = 0, v = 0;
     palette().color(QPalette::Window).darker(150).getHsv(&h, &s, &v);
     const QColor fg2(QColor::fromHsv(h + 120, s, v));
 
diff --git a/src/analyzer/boomanalyzer.cpp b/src/analyzer/boomanalyzer.cpp
index 85ab2114b..a6e70b04e 100644
--- a/src/analyzer/boomanalyzer.cpp
+++ b/src/analyzer/boomanalyzer.cpp
@@ -116,7 +116,7 @@ void BoomAnalyzer::analyze(QPainter& p, const Scope& scope, bool new_frame) {
     p.drawPixmap(0, 0, canvas_);
     return;
   }
-  double h;
+  double h = 0.0;
   const uint MAX_HEIGHT = height() - 1;
 
   QPainter canvas_painter(&canvas_);
@@ -124,7 +124,7 @@ void BoomAnalyzer::analyze(QPainter& p, const Scope& scope, bool new_frame) {
 
   Analyzer::interpolate(scope, scope_);
 
-  for (int i = 0, x = 0, y; i < bands_; ++i, x += kColumnWidth + 1) {
+  for (int i = 0, x = 0, y = 0; i < bands_; ++i, x += kColumnWidth + 1) {
     h = log10(scope_[i] * 256.0) * F_;
 
     if (h > MAX_HEIGHT) h = MAX_HEIGHT;
diff --git a/src/analyzer/fht.cpp b/src/analyzer/fht.cpp
index 2c6a04e68..bf3fafccd 100644
--- a/src/analyzer/fht.cpp
+++ b/src/analyzer/fht.cpp
@@ -68,7 +68,7 @@ void FHT::ewma(float* d, float* s, float w) {
 
 void FHT::logSpectrum(float* out, float* p) {
 
-  int n = num_ / 2, i, j, k, *r;
+  int n = num_ / 2, i = 0, j = 0, k = 0, *r = nullptr;
   if (log_vector_.size() < n) {
     log_vector_.resize(n);
     float f = n / log10(static_cast<double>(n));
@@ -135,8 +135,8 @@ void FHT::transform(float* p) {
 
 void FHT::transform8(float* p) {
 
-  float a, b, c, d, e, f, g, h, b_f2, d_h2;
-  float a_c_eg, a_ce_g, ac_e_g, aceg, b_df_h, bdfh;
+  float a = 0.0, b = 0.0, c = 0.0, d = 0.0, e = 0.0, f = 0.0, g = 0.0, h = 0.0, b_f2 = 0.0, d_h2 = 0.0;
+  float a_c_eg = 0.0, a_ce_g = 0.0, ac_e_g = 0.0, aceg = 0.0, b_df_h = 0.0, bdfh = 0.0;
 
   a = *p++, b = *p++, c = *p++, d = *p++;
   e = *p++, f = *p++, g = *p++, h = *p;
@@ -169,8 +169,8 @@ void FHT::_transform(float* p, int n, int k) {
     return;
   }
 
-  int i, j, ndiv2 = n / 2;
-  float a, *t1, *t2, *t3, *t4, *ptab, *pp;
+  int i = 0, j = 0, ndiv2 = n / 2;
+  float a = 0.0, *t1 = nullptr, *t2 = nullptr, *t3 = nullptr, *t4 = nullptr, *ptab = nullptr, *pp = nullptr;
 
   for (i = 0, t1 = buf_(), t2 = buf_() + ndiv2, pp = &p[k]; i < ndiv2; i++)
     *t1++ = *pp++, *t2++ = *pp++;
diff --git a/src/collection/collectionmodel.cpp b/src/collection/collectionmodel.cpp
index c1e177d37..3d357ebc0 100644
--- a/src/collection/collectionmodel.cpp
+++ b/src/collection/collectionmodel.cpp
@@ -1914,7 +1914,7 @@ QDataStream &operator<<(QDataStream &s, const CollectionModel::Grouping &g) {
 
 QDataStream &operator>>(QDataStream &s, CollectionModel::Grouping &g) {
 
-  quint32 buf;
+  quint32 buf = 0;
   s >> buf;
   g.first = CollectionModel::GroupBy(buf);
   s >> buf;
diff --git a/src/core/filesystemwatcherinterface.cpp b/src/core/filesystemwatcherinterface.cpp
index d3fa6043c..3131e5187 100644
--- a/src/core/filesystemwatcherinterface.cpp
+++ b/src/core/filesystemwatcherinterface.cpp
@@ -33,11 +33,11 @@ FileSystemWatcherInterface::FileSystemWatcherInterface(QObject *parent)
     : QObject(parent) {}
 
 FileSystemWatcherInterface *FileSystemWatcherInterface::Create(QObject *parent) {
-  FileSystemWatcherInterface *ret;
+
 #ifdef Q_OS_MACOS
-  ret = new MacFSListener(parent);
+  FileSystemWatcherInterface *ret = new MacFSListener(parent);
 #else
-  ret = new QtFSListener(parent);
+  FileSystemWatcherInterface *ret = new QtFSListener(parent);
 #endif
 
   ret->Init();
diff --git a/src/core/mergedproxymodel.cpp b/src/core/mergedproxymodel.cpp
index 513f55917..260e5db68 100644
--- a/src/core/mergedproxymodel.cpp
+++ b/src/core/mergedproxymodel.cpp
@@ -282,7 +282,7 @@ QModelIndex MergedProxyModel::mapFromSource(const QModelIndex &source_index) con
 
   // Add a mapping if we don't have one already
   const auto &it = p_->mappings_.get<tag_by_source>().find(source_index);
-  Mapping *mapping;
+  Mapping *mapping = nullptr;
   if (it != p_->mappings_.get<tag_by_source>().end()) {
     mapping = *it;
   }
diff --git a/src/core/songloader.cpp b/src/core/songloader.cpp
index 7e52a126c..e3a3cd5d1 100644
--- a/src/core/songloader.cpp
+++ b/src/core/songloader.cpp
@@ -566,8 +566,8 @@ void SongLoader::ErrorMessageReceived(GstMessage *msg) {
 
   if (state_ == Finished) return;
 
-  GError *error;
-  gchar *debugs;
+  GError *error = nullptr;
+  gchar *debugs = nullptr;
 
   gst_message_parse_error(msg, &error, &debugs);
   qLog(Error) << __PRETTY_FUNCTION__ << error->message;
diff --git a/src/core/utilities.cpp b/src/core/utilities.cpp
index b2d533d09..08a9377f2 100644
--- a/src/core/utilities.cpp
+++ b/src/core/utilities.cpp
@@ -315,7 +315,7 @@ bool Copy(QIODevice *source, QIODevice *destination) {
   std::unique_ptr<char[]> data(new char[bytes]);
   qint64 pos = 0;
 
-  qint64 bytes_read;
+  qint64 bytes_read = 0;
   do {
     bytes_read = source->read(data.get() + pos, bytes - pos);
     if (bytes_read == -1) return false;
@@ -324,7 +324,7 @@ bool Copy(QIODevice *source, QIODevice *destination) {
   } while (bytes_read > 0 && pos != bytes);
 
   pos = 0;
-  qint64 bytes_written;
+  qint64 bytes_written = 0;
   do {
     bytes_written = destination->write(data.get() + pos, bytes - pos);
     if (bytes_written == -1) return false;
diff --git a/src/device/cddasongloader.cpp b/src/device/cddasongloader.cpp
index bae468503..bd558d9ee 100644
--- a/src/device/cddasongloader.cpp
+++ b/src/device/cddasongloader.cpp
@@ -166,7 +166,7 @@ void CddaSongLoader::LoadSongs() {
 
   // Handle TOC message: get tracks duration
   if (msg_toc) {
-    GstToc *toc;
+    GstToc *toc = nullptr;
     gst_message_parse_toc (msg_toc, &toc, nullptr);
     if (toc) {
       GList *entries = gst_toc_get_entries(toc);
@@ -175,7 +175,7 @@ void CddaSongLoader::LoadSongs() {
         for (GList *node = entries; node != nullptr; node = node->next) {
           GstTocEntry *entry = static_cast<GstTocEntry*>(node->data);
           quint64 duration = 0;
-          gint64 start, stop;
+          gint64 start = 0, stop = 0;
           if (gst_toc_entry_get_start_stop_times (entry, &start, &stop)) duration = stop - start;
           songs[i++].set_length_nanosec(duration);
         }
diff --git a/src/engine/gstenginepipeline.cpp b/src/engine/gstenginepipeline.cpp
index 188f254f4..0dcf3b275 100644
--- a/src/engine/gstenginepipeline.cpp
+++ b/src/engine/gstenginepipeline.cpp
@@ -215,7 +215,7 @@ bool GstEnginePipeline::InitFromUrl(const QByteArray &stream_url, const QUrl ori
 
   g_object_set(G_OBJECT(pipeline_), "uri", stream_url.constData(), nullptr);
 
-  gint flags;
+  gint flags = 0;
   g_object_get(G_OBJECT(pipeline_), "flags", &flags, nullptr);
   flags |= 0x00000002;
   flags &= ~0x00000001;
@@ -816,7 +816,7 @@ GstBusSyncReply GstEnginePipeline::BusCallbackSync(GstBus*, GstMessage *msg, gpo
 
 void GstEnginePipeline::StreamStatusMessageReceived(GstMessage *msg) {
 
-  GstStreamStatusType type;
+  GstStreamStatusType type = GST_STREAM_STATUS_TYPE_CREATE;
   GstElement *owner = nullptr;
   gst_message_parse_stream_status(msg, &type, &owner);
 
@@ -985,7 +985,7 @@ QString GstEnginePipeline::ParseStrTag(GstTagList *list, const char *tag) const
 
 guint GstEnginePipeline::ParseUIntTag(GstTagList *list, const char *tag) const {
 
-  guint data;
+  guint data = 0;
   bool success = gst_tag_list_get_uint(list, tag, &data);
 
   guint ret = 0;
@@ -1001,7 +1001,7 @@ void GstEnginePipeline::StateChangedMessageReceived(GstMessage *msg) {
     return;
   }
 
-  GstState old_state, new_state, pending;
+  GstState old_state = GST_STATE_NULL, new_state = GST_STATE_NULL, pending = GST_STATE_NULL;
   gst_message_parse_state_changed(msg, &old_state, &new_state, &pending);
 
   if (!pipeline_is_initialized_ && (new_state == GST_STATE_PAUSED || new_state == GST_STATE_PLAYING)) {
@@ -1074,7 +1074,7 @@ qint64 GstEnginePipeline::length() const {
 
 GstState GstEnginePipeline::state() const {
 
-  GstState s, sp;
+  GstState s = GST_STATE_NULL, sp = GST_STATE_NULL;
   if (!pipeline_ || gst_element_get_state(pipeline_, &s, &sp, kGstStateTimeoutNanosecs) == GST_STATE_CHANGE_FAILURE)
     return GST_STATE_NULL;
 
diff --git a/src/internet/localredirectserver.cpp b/src/internet/localredirectserver.cpp
index 7c2e65b3e..0a29c4e8b 100644
--- a/src/internet/localredirectserver.cpp
+++ b/src/internet/localredirectserver.cpp
@@ -71,7 +71,7 @@ bool LocalRedirectServer::GenerateCertificate() {
     return false;
   }
 
-  gnutls_x509_privkey_t key;
+  gnutls_x509_privkey_t key = nullptr;
   if (int result = gnutls_x509_privkey_init(&key) != GNUTLS_E_SUCCESS) {
     error_ = QString("Failed to initialize the private key structure: %1").arg(gnutls_strerror(result));
     gnutls_global_deinit();
@@ -104,7 +104,7 @@ bool LocalRedirectServer::GenerateCertificate() {
     return false;
   }
 
-  gnutls_x509_crt_t crt;
+  gnutls_x509_crt_t crt = nullptr;
   if (int result = gnutls_x509_crt_init(&crt) != GNUTLS_E_SUCCESS) {
     error_ = QString("Failed to initialize an X.509 certificate structure: %1").arg(gnutls_strerror(result));
     gnutls_x509_privkey_deinit(key);
@@ -173,7 +173,7 @@ bool LocalRedirectServer::GenerateCertificate() {
     return false;
   }
 
-  gnutls_privkey_t pkey;
+  gnutls_privkey_t pkey = nullptr;
   if (int result = gnutls_privkey_init(&pkey) != GNUTLS_E_SUCCESS) {
     error_ = QString("Failed to initialize a private key object: %1").arg(gnutls_strerror(result));
     gnutls_x509_privkey_deinit(key);
diff --git a/src/moodbar/moodbarpipeline.cpp b/src/moodbar/moodbarpipeline.cpp
index f29451035..bfe1a6749 100644
--- a/src/moodbar/moodbarpipeline.cpp
+++ b/src/moodbar/moodbarpipeline.cpp
@@ -134,8 +134,8 @@ void MoodbarPipeline::Start() {
 
 void MoodbarPipeline::ReportError(GstMessage *msg) {
 
-  GError *error;
-  gchar *debugs;
+  GError *error = nullptr;
+  gchar *debugs = nullptr;
 
   gst_message_parse_error(msg, &error, &debugs);
   QString message = QString::fromLocal8Bit(error->message);
diff --git a/src/moodbar/moodbarrenderer.cpp b/src/moodbar/moodbarrenderer.cpp
index fb8da475d..df3fb9c1c 100644
--- a/src/moodbar/moodbarrenderer.cpp
+++ b/src/moodbar/moodbarrenderer.cpp
@@ -136,7 +136,7 @@ void MoodbarRenderer::Render(const ColorVector &colors, QPainter *p, const QRect
 
   // Draw the actual moodbar.
   for (int x = 0; x < rect.width(); x++) {
-    int h, s, v;
+    int h = 0, s = 0, v = 0;
     screen_colors[x].getHsv(&h, &s, &v);
 
     for (int y = 0; y <= rect.height() / 2; y++) {
diff --git a/src/playlist/playlistfilterparser.cpp b/src/playlist/playlistfilterparser.cpp
index 6ce0c4c72..6907dd1ef 100644
--- a/src/playlist/playlistfilterparser.cpp
+++ b/src/playlist/playlistfilterparser.cpp
@@ -440,7 +440,7 @@ FilterTree *FilterParser::createSearchTermTreeNode(const QString &col, const QSt
   }
   else if (!col.isEmpty() && columns_.contains(col) && numerical_columns_.contains(columns_[col])) {
     // the length column contains the time in seconds (nano seconds, actually - the "nano" part is handled by the DropTailComparatorDecorator,  though).
-    int search_value;
+    int search_value = 0;
     if (columns_[col] == Playlist::Column_Length) {
       search_value = parseTime(search);
     }
diff --git a/src/playlist/playlisttabbar.cpp b/src/playlist/playlisttabbar.cpp
index 8c53380d2..d59b27067 100644
--- a/src/playlist/playlisttabbar.cpp
+++ b/src/playlist/playlisttabbar.cpp
@@ -226,7 +226,7 @@ void PlaylistTabBar::CloseSlot() {
     QDialogButtonBox *buttons = confirmation_box.findChild<QDialogButtonBox*>();
     if (grid && buttons) {
       const int index = grid->indexOf(buttons);
-      int row, column, row_span, column_span = 0;
+      int row = 0, column = 0, row_span = 0, column_span = 0;
       grid->getItemPosition(index, &row, &column, &row_span, &column_span);
       QLayoutItem *buttonsItem = grid->takeAt(index);
       grid->addWidget(&dont_prompt_again, row, column, row_span, column_span, Qt::AlignLeft | Qt::AlignTop);
diff --git a/src/settings/notificationssettingspage.cpp b/src/settings/notificationssettingspage.cpp
index 19376a730..9f8983a61 100644
--- a/src/settings/notificationssettingspage.cpp
+++ b/src/settings/notificationssettingspage.cpp
@@ -303,7 +303,7 @@ void NotificationsSettingsPage::ChooseFgColor() {
 
 void NotificationsSettingsPage::ChooseFont() {
 
-  bool ok;
+  bool ok = false;
   QFont font = QFontDialog::getFont(&ok, pretty_popup_->font(), this);
   if (ok) {
     pretty_popup_->set_font(font);
diff --git a/src/smartplaylists/smartplaylistsearch.cpp b/src/smartplaylists/smartplaylistsearch.cpp
index f686c98ef..490e6bd5d 100644
--- a/src/smartplaylists/smartplaylistsearch.cpp
+++ b/src/smartplaylists/smartplaylistsearch.cpp
@@ -134,8 +134,8 @@ QDataStream &operator<<(QDataStream &s, const SmartPlaylistSearch &search) {
 
 QDataStream &operator>>(QDataStream &s, SmartPlaylistSearch &search) {
 
-  quint8 sort_type, sort_field, search_type;
-  qint32 limit;
+  quint8 sort_type = 0, sort_field = 0, search_type = 0;
+  qint32 limit = 0;
 
   s >> search.terms_ >> sort_type >> sort_field >> limit >> search_type;
   search.sort_type_ = SmartPlaylistSearch::SortType(sort_type);
diff --git a/src/smartplaylists/smartplaylistsearchterm.cpp b/src/smartplaylists/smartplaylistsearchterm.cpp
index 26004da94..bebcc3941 100644
--- a/src/smartplaylists/smartplaylistsearchterm.cpp
+++ b/src/smartplaylists/smartplaylistsearchterm.cpp
@@ -456,7 +456,7 @@ QDataStream &operator<<(QDataStream &s, const SmartPlaylistSearchTerm &term) {
 
 QDataStream &operator>>(QDataStream &s, SmartPlaylistSearchTerm &term) {
 
-  quint8 field, op, date;
+  quint8 field = 0, op = 0, date = 0;
   s >> field >> op >> term.value_ >> term.second_value_ >> date;
   term.field_ = SmartPlaylistSearchTerm::Field(field);
   term.operator_ = SmartPlaylistSearchTerm::Operator(op);
diff --git a/src/subsonic/subsonicrequest.cpp b/src/subsonic/subsonicrequest.cpp
index 0e6d52440..e28560240 100644
--- a/src/subsonic/subsonicrequest.cpp
+++ b/src/subsonic/subsonicrequest.cpp
@@ -153,8 +153,7 @@ void SubsonicRequest::FlushAlbumsRequests() {
     if (request.size > 0) params << Param("size", QString::number(request.size));
     if (request.offset > 0) params << Param("offset", QString::number(request.offset));
 
-    QNetworkReply *reply;
-    reply = CreateGetRequest(QString("getAlbumList2"), params);
+    QNetworkReply *reply = CreateGetRequest(QString("getAlbumList2"), params);
     replies_ << reply;
     QObject::connect(reply, &QNetworkReply::finished, this, [this, reply, request]() { AlbumsReplyReceived(reply, request.offset); });
 
diff --git a/src/subsonic/subsonicscrobblerequest.cpp b/src/subsonic/subsonicscrobblerequest.cpp
index 6641b1e06..51cf7be8a 100644
--- a/src/subsonic/subsonicscrobblerequest.cpp
+++ b/src/subsonic/subsonicscrobblerequest.cpp
@@ -81,8 +81,7 @@ void SubsonicScrobbleRequest::FlushScrobbleRequests() {
       Param("submission", QVariant(request.submission).toString()) <<
       Param("time", QVariant(request.time_ms).toString());
 
-    QNetworkReply *reply;
-    reply = CreateGetRequest(QString("scrobble"), params);
+    QNetworkReply *reply = CreateGetRequest(QString("scrobble"), params);
     replies_ << reply;
     QObject::connect(reply, &QNetworkReply::finished, this, [this, reply]() { ScrobbleReplyReceived(reply); });
 
diff --git a/src/tidal/tidalservice.cpp b/src/tidal/tidalservice.cpp
index 88074280b..9247b6c9e 100644
--- a/src/tidal/tidalservice.cpp
+++ b/src/tidal/tidalservice.cpp
@@ -934,7 +934,7 @@ void TidalService::CancelSearch() {
 
 void TidalService::SendSearch() {
 
-  TidalBaseRequest::QueryType type;
+  TidalBaseRequest::QueryType type = TidalBaseRequest::QueryType_None;
 
   switch (pending_search_type_) {
     case InternetSearchView::SearchType_Artists:
diff --git a/src/transcoder/transcoder.cpp b/src/transcoder/transcoder.cpp
index c4c54aebf..4b0ca662f 100644
--- a/src/transcoder/transcoder.cpp
+++ b/src/transcoder/transcoder.cpp
@@ -396,8 +396,8 @@ GstBusSyncReply Transcoder::BusCallbackSync(GstBus*, GstMessage *msg, gpointer d
 
 void Transcoder::JobState::ReportError(GstMessage *msg) {
 
-  GError *error;
-  gchar *debugs;
+  GError *error = nullptr;
+  gchar *debugs = nullptr;
 
   gst_message_parse_error(msg, &error, &debugs);
   QString message = QString::fromLocal8Bit(error->message);
diff --git a/src/widgets/fancytabwidget.cpp b/src/widgets/fancytabwidget.cpp
index 3148bb5cc..04e71a317 100644
--- a/src/widgets/fancytabwidget.cpp
+++ b/src/widgets/fancytabwidget.cpp
@@ -271,7 +271,7 @@ class FancyTabBar: public QTabBar {
       {
         p.save();
         QTransform m;
-        int textFlags;
+        int textFlags = 0;
         Qt::Alignment iconFlags;
 
         QRect tabrectText;
diff --git a/src/widgets/groupediconview.cpp b/src/widgets/groupediconview.cpp
index 1d4d731e0..8d48f3ec4 100644
--- a/src/widgets/groupediconview.cpp
+++ b/src/widgets/groupediconview.cpp
@@ -278,7 +278,7 @@ void GroupedIconView::paintEvent(QPaintEvent *e) {
     if (selections && selections->isSelected(*it))
       option.state |= QStyle::State_Selected;
     if (enabled) {
-      QPalette::ColorGroup cg;
+      QPalette::ColorGroup cg = QPalette::Active;
       if ((itemModel->flags(*it) & Qt::ItemIsEnabled) == 0) {
         option.state &= ~QStyle::State_Enabled;
         cg = QPalette::Disabled;