diff --git a/tests/cefsimple/cefsimple_linux.cc b/tests/cefsimple/cefsimple_linux.cc
index e67ed2631..87efbb79d 100644
--- a/tests/cefsimple/cefsimple_linux.cc
+++ b/tests/cefsimple/cefsimple_linux.cc
@@ -39,7 +39,7 @@ int main(int argc, char* argv[]) {
   // CEF applications have multiple sub-processes (render, plugin, GPU, etc)
   // that share the same executable. This function checks the command-line and,
   // if this is a sub-process, executes the appropriate logic.
-  int exit_code = CefExecuteProcess(main_args, NULL, NULL);
+  int exit_code = CefExecuteProcess(main_args, nullptr, nullptr);
   if (exit_code >= 0) {
     // The sub-process has completed so return here.
     return exit_code;
@@ -68,7 +68,7 @@ int main(int argc, char* argv[]) {
   CefRefPtr<SimpleApp> app(new SimpleApp);
 
   // Initialize CEF for the browser process.
-  CefInitialize(main_args, settings, app.get(), NULL);
+  CefInitialize(main_args, settings, app.get(), nullptr);
 
   // Run the CEF message loop. This will block until CefQuitMessageLoop() is
   // called.
diff --git a/tests/cefsimple/cefsimple_win.cc b/tests/cefsimple/cefsimple_win.cc
index 1e9af869d..14fe5e1b8 100644
--- a/tests/cefsimple/cefsimple_win.cc
+++ b/tests/cefsimple/cefsimple_win.cc
@@ -30,7 +30,7 @@ int APIENTRY wWinMain(HINSTANCE hInstance,
   // Enable High-DPI support on Windows 7 or newer.
   CefEnableHighDPISupport();
 
-  void* sandbox_info = NULL;
+  void* sandbox_info = nullptr;
 
 #if defined(CEF_USE_SANDBOX)
   // Manage the life span of the sandbox information object. This is necessary
@@ -45,7 +45,7 @@ int APIENTRY wWinMain(HINSTANCE hInstance,
   // CEF applications have multiple sub-processes (render, plugin, GPU, etc)
   // that share the same executable. This function checks the command-line and,
   // if this is a sub-process, executes the appropriate logic.
-  int exit_code = CefExecuteProcess(main_args, NULL, sandbox_info);
+  int exit_code = CefExecuteProcess(main_args, nullptr, sandbox_info);
   if (exit_code >= 0) {
     // The sub-process has completed so return here.
     return exit_code;
diff --git a/tests/cefsimple/process_helper_mac.cc b/tests/cefsimple/process_helper_mac.cc
index f1f42c337..224593dd5 100644
--- a/tests/cefsimple/process_helper_mac.cc
+++ b/tests/cefsimple/process_helper_mac.cc
@@ -31,5 +31,5 @@ int main(int argc, char* argv[]) {
   CefMainArgs main_args(argc, argv);
 
   // Execute the sub-process.
-  return CefExecuteProcess(main_args, NULL, NULL);
+  return CefExecuteProcess(main_args, nullptr, nullptr);
 }
diff --git a/tests/cefsimple/simple_app.cc b/tests/cefsimple/simple_app.cc
index 289da9455..e9c8a5f0e 100644
--- a/tests/cefsimple/simple_app.cc
+++ b/tests/cefsimple/simple_app.cc
@@ -32,7 +32,7 @@ class SimpleWindowDelegate : public CefWindowDelegate {
   }
 
   void OnWindowDestroyed(CefRefPtr<CefWindow> window) OVERRIDE {
-    browser_view_ = NULL;
+    browser_view_ = nullptr;
   }
 
   bool CanClose(CefRefPtr<CefWindow> window) OVERRIDE {
@@ -91,7 +91,7 @@ void SimpleApp::OnContextInitialized() {
   if (use_views) {
     // Create the BrowserView.
     CefRefPtr<CefBrowserView> browser_view = CefBrowserView::CreateBrowserView(
-        handler, url, browser_settings, NULL, NULL, NULL);
+        handler, url, browser_settings, nullptr, nullptr, nullptr);
 
     // Create the Window. It will show itself after creation.
     CefWindow::CreateTopLevelWindow(new SimpleWindowDelegate(browser_view));
@@ -107,6 +107,6 @@ void SimpleApp::OnContextInitialized() {
 
     // Create the first browser window.
     CefBrowserHost::CreateBrowser(window_info, handler, url, browser_settings,
-                                  NULL, NULL);
+                                  nullptr, nullptr);
   }
 }
diff --git a/tests/cefsimple/simple_handler.cc b/tests/cefsimple/simple_handler.cc
index 352622a5d..fafedc85d 100644
--- a/tests/cefsimple/simple_handler.cc
+++ b/tests/cefsimple/simple_handler.cc
@@ -17,7 +17,7 @@
 
 namespace {
 
-SimpleHandler* g_instance = NULL;
+SimpleHandler* g_instance = nullptr;
 
 // Returns a data: URI with the specified contents.
 std::string GetDataURI(const std::string& data, const std::string& mime_type) {
@@ -35,7 +35,7 @@ SimpleHandler::SimpleHandler(bool use_views)
 }
 
 SimpleHandler::~SimpleHandler() {
-  g_instance = NULL;
+  g_instance = nullptr;
 }
 
 // static