diff --git a/src/podcasts/addpodcastbyurl.h b/src/podcasts/addpodcastbyurl.h
index 3a49959d5..a9a3e2fbc 100644
--- a/src/podcasts/addpodcastbyurl.h
+++ b/src/podcasts/addpodcastbyurl.h
@@ -32,7 +32,7 @@ class AddPodcastByUrl : public AddPodcastPage {
   Q_OBJECT
 
  public:
-  AddPodcastByUrl(Application* app, QWidget* parent = 0);
+  AddPodcastByUrl(Application* app, QWidget* parent = nullptr);
   ~AddPodcastByUrl();
 
   void Show();
diff --git a/src/podcasts/addpodcastdialog.h b/src/podcasts/addpodcastdialog.h
index db77ddc8e..283abac72 100644
--- a/src/podcasts/addpodcastdialog.h
+++ b/src/podcasts/addpodcastdialog.h
@@ -35,7 +35,7 @@ class AddPodcastDialog : public QDialog {
   Q_OBJECT
 
  public:
-  AddPodcastDialog(Application* app, QWidget* parent = 0);
+  AddPodcastDialog(Application* app, QWidget* parent = nullptr);
   ~AddPodcastDialog();
 
   static const char* kBbcOpmlUrl;
diff --git a/src/podcasts/addpodcastpage.h b/src/podcasts/addpodcastpage.h
index a9747fffa..083c33335 100644
--- a/src/podcasts/addpodcastpage.h
+++ b/src/podcasts/addpodcastpage.h
@@ -27,7 +27,7 @@ class AddPodcastPage : public QWidget {
   Q_OBJECT
 
  public:
-  AddPodcastPage(Application* app, QWidget* parent = 0);
+  AddPodcastPage(Application* app, QWidget* parent = nullptr);
 
   PodcastDiscoveryModel* model() const { return model_; }
 
diff --git a/src/podcasts/fixedopmlpage.h b/src/podcasts/fixedopmlpage.h
index 2293d2274..aa91aa5bc 100644
--- a/src/podcasts/fixedopmlpage.h
+++ b/src/podcasts/fixedopmlpage.h
@@ -30,7 +30,7 @@ class FixedOpmlPage : public AddPodcastPage {
 
  public:
   FixedOpmlPage(const QUrl& opml_url, const QString& title, const QIcon& icon,
-                Application* app, QWidget* parent = 0);
+                Application* app, QWidget* parent = nullptr);
 
   bool has_visible_widget() const { return false; }
   void Show();
diff --git a/src/podcasts/gpoddersearchpage.h b/src/podcasts/gpoddersearchpage.h
index 83455e6a9..b3a477d64 100644
--- a/src/podcasts/gpoddersearchpage.h
+++ b/src/podcasts/gpoddersearchpage.h
@@ -30,7 +30,7 @@ class GPodderSearchPage : public AddPodcastPage {
   Q_OBJECT
 
  public:
-  GPodderSearchPage(Application* app, QWidget* parent = 0);
+  GPodderSearchPage(Application* app, QWidget* parent = nullptr);
   ~GPodderSearchPage();
 
   void Show();
diff --git a/src/podcasts/gpoddersync.h b/src/podcasts/gpoddersync.h
index 0f1ea7864..529fdf2c9 100644
--- a/src/podcasts/gpoddersync.h
+++ b/src/podcasts/gpoddersync.h
@@ -43,7 +43,7 @@ class GPodderSync : public QObject {
   Q_OBJECT
 
  public:
-  GPodderSync(Application* app, QObject* parent = 0);
+  GPodderSync(Application* app, QObject* parent = nullptr);
   ~GPodderSync();
 
   static const char* kSettingsGroup;
diff --git a/src/podcasts/gpoddertoptagsmodel.h b/src/podcasts/gpoddertoptagsmodel.h
index 92f8fa9e5..e3bd4b730 100644
--- a/src/podcasts/gpoddertoptagsmodel.h
+++ b/src/podcasts/gpoddertoptagsmodel.h
@@ -30,7 +30,7 @@ class GPodderTopTagsModel : public PodcastDiscoveryModel {
 
  public:
   GPodderTopTagsModel(mygpo::ApiRequest* api, Application* app,
-                      QObject* parent = 0);
+                      QObject* parent = nullptr);
 
   enum Role {
     Role_HasLazyLoaded = PodcastDiscoveryModel::RoleCount,
diff --git a/src/podcasts/gpoddertoptagspage.h b/src/podcasts/gpoddertoptagspage.h
index 6fae2aade..df337ad07 100644
--- a/src/podcasts/gpoddertoptagspage.h
+++ b/src/podcasts/gpoddertoptagspage.h
@@ -30,7 +30,7 @@ class GPodderTopTagsPage : public AddPodcastPage {
   Q_OBJECT
 
  public:
-  GPodderTopTagsPage(Application* app, QWidget* parent = 0);
+  GPodderTopTagsPage(Application* app, QWidget* parent = nullptr);
   ~GPodderTopTagsPage();
 
   static const int kMaxTagCount;
diff --git a/src/podcasts/podcastbackend.h b/src/podcasts/podcastbackend.h
index 55946f48c..28b80bf50 100644
--- a/src/podcasts/podcastbackend.h
+++ b/src/podcasts/podcastbackend.h
@@ -29,7 +29,7 @@ class PodcastBackend : public QObject {
   Q_OBJECT
 
  public:
-  PodcastBackend(Application* app, QObject* parent = 0);
+  PodcastBackend(Application* app, QObject* parent = nullptr);
 
   // Adds the podcast and any included Episodes to the database.  Updates the
   // podcast with a database ID.  If this podcast already has an ID set, this
diff --git a/src/podcasts/podcastdiscoverymodel.h b/src/podcasts/podcastdiscoverymodel.h
index 08ca10bee..7d55b9496 100644
--- a/src/podcasts/podcastdiscoverymodel.h
+++ b/src/podcasts/podcastdiscoverymodel.h
@@ -32,7 +32,7 @@ class PodcastDiscoveryModel : public QStandardItemModel {
   Q_OBJECT
 
  public:
-  PodcastDiscoveryModel(Application* app, QObject* parent = 0);
+  PodcastDiscoveryModel(Application* app, QObject* parent = nullptr);
 
   enum Type { Type_Folder, Type_Podcast, Type_LoadingIndicator };
 
diff --git a/src/podcasts/podcastdownloader.h b/src/podcasts/podcastdownloader.h
index 73ca00a90..500e42876 100644
--- a/src/podcasts/podcastdownloader.h
+++ b/src/podcasts/podcastdownloader.h
@@ -42,7 +42,7 @@ class PodcastDownloader : public QObject {
   Q_OBJECT
 
  public:
-  PodcastDownloader(Application* app, QObject* parent = 0);
+  PodcastDownloader(Application* app, QObject* parent = nullptr);
 
   enum State { NotDownloading, Queued, Downloading, Finished };
 
diff --git a/src/podcasts/podcastinfowidget.h b/src/podcasts/podcastinfowidget.h
index 5ab8dd22a..375d700ac 100644
--- a/src/podcasts/podcastinfowidget.h
+++ b/src/podcasts/podcastinfowidget.h
@@ -32,7 +32,7 @@ class PodcastInfoWidget : public QWidget {
   Q_OBJECT
 
  public:
-  explicit PodcastInfoWidget(QWidget* parent = 0);
+  explicit PodcastInfoWidget(QWidget* parent = nullptr);
   ~PodcastInfoWidget();
 
   void SetApplication(Application* app);
diff --git a/src/podcasts/podcastservicemodel.h b/src/podcasts/podcastservicemodel.h
index 24a0ef609..eaa243c82 100644
--- a/src/podcasts/podcastservicemodel.h
+++ b/src/podcasts/podcastservicemodel.h
@@ -26,7 +26,7 @@ class PodcastServiceModel : public QStandardItemModel {
   Q_OBJECT
 
  public:
-  explicit PodcastServiceModel(QObject* parent = 0);
+  explicit PodcastServiceModel(QObject* parent = nullptr);
 
   QMimeData* mimeData(const QModelIndexList& indexes) const;
 
diff --git a/src/podcasts/podcastupdater.h b/src/podcasts/podcastupdater.h
index 3cc4ffd28..523f9d95d 100644
--- a/src/podcasts/podcastupdater.h
+++ b/src/podcasts/podcastupdater.h
@@ -34,7 +34,7 @@ class PodcastUpdater : public QObject {
   Q_OBJECT
 
  public:
-  PodcastUpdater(Application* app, QObject* parent = 0);
+  PodcastUpdater(Application* app, QObject* parent = nullptr);
 
   static const char* kSettingsGroup;
 
diff --git a/src/podcasts/podcasturlloader.h b/src/podcasts/podcasturlloader.h
index db25dba34..bc104323d 100644
--- a/src/podcasts/podcasturlloader.h
+++ b/src/podcasts/podcasturlloader.h
@@ -67,7 +67,7 @@ class PodcastUrlLoader : public QObject {
   Q_OBJECT
 
  public:
-  explicit PodcastUrlLoader(QObject* parent = 0);
+  explicit PodcastUrlLoader(QObject* parent = nullptr);
   ~PodcastUrlLoader();
 
   static const int kMaxRedirects;