diff --git a/src/platform/qt/AudioDevice.h b/src/platform/qt/AudioDevice.h
index 1703d08eb..5bddac4c9 100644
--- a/src/platform/qt/AudioDevice.h
+++ b/src/platform/qt/AudioDevice.h
@@ -16,7 +16,7 @@ class AudioThread : public QThread {
 Q_OBJECT
 
 public:
-	AudioThread(QObject* parent = 0);
+	AudioThread(QObject* parent = nullptr);
 
 	void setInput(GBAAudio* input);
 
@@ -35,13 +35,13 @@ class AudioDevice : public QIODevice {
 Q_OBJECT
 
 public:
-	AudioDevice(GBAAudio* audio, QObject* parent = 0);
+	AudioDevice(GBAAudio* audio, QObject* parent = nullptr);
 
 	void setFormat(const QAudioFormat& format);
 
 protected:
-	virtual qint64 readData(char* data, qint64 maxSize);
-	virtual qint64 writeData(const char* data, qint64 maxSize);
+	virtual qint64 readData(char* data, qint64 maxSize) override;
+	virtual qint64 writeData(const char* data, qint64 maxSize) override;
 
 private:
 	GBAAudio* m_audio;
diff --git a/src/platform/qt/Display.h b/src/platform/qt/Display.h
index dd7cedb2a..7d626cace 100644
--- a/src/platform/qt/Display.h
+++ b/src/platform/qt/Display.h
@@ -14,15 +14,15 @@ class Display : public QGLWidget {
 Q_OBJECT
 
 public:
-	Display(QWidget* parent = 0);
+	Display(QWidget* parent = nullptr);
 
 public slots:
 	void startDrawing(const uint32_t* buffer, GBAThread* context);
 	void stopDrawing();
 
 protected:
-	virtual void paintEvent(QPaintEvent*) {};
-	virtual void resizeEvent(QResizeEvent*);
+	virtual void paintEvent(QPaintEvent*) override {};
+	virtual void resizeEvent(QResizeEvent*) override;
 
 private:
 	Painter* m_painter;
diff --git a/src/platform/qt/GameController.cpp b/src/platform/qt/GameController.cpp
index 0d501209c..8a39c0cda 100644
--- a/src/platform/qt/GameController.cpp
+++ b/src/platform/qt/GameController.cpp
@@ -10,7 +10,7 @@ using namespace QGBA;
 GameController::GameController(QObject* parent)
 	: QObject(parent)
 	, m_drawContext(new uint32_t[256 * 256])
-	, m_audioContext(0)
+	, m_audioContext(nullptr)
 {
 	m_renderer = new GBAVideoSoftwareRenderer;
 	GBAVideoSoftwareRendererCreate(m_renderer);
diff --git a/src/platform/qt/GameController.h b/src/platform/qt/GameController.h
index 56b7bd15d..abdfb22d6 100644
--- a/src/platform/qt/GameController.h
+++ b/src/platform/qt/GameController.h
@@ -22,7 +22,7 @@ class GameController : public QObject {
 Q_OBJECT
 
 public:
-	GameController(QObject* parent = 0);
+	GameController(QObject* parent = nullptr);
 	~GameController();
 
 	const uint32_t* drawContext() const { return m_drawContext; }
diff --git a/src/platform/qt/Window.h b/src/platform/qt/Window.h
index a29165d91..d02045492 100644
--- a/src/platform/qt/Window.h
+++ b/src/platform/qt/Window.h
@@ -19,7 +19,7 @@ class Window : public QMainWindow {
 Q_OBJECT
 
 public:
-	Window(QWidget* parent = 0);
+	Window(QWidget* parent = nullptr);
 	static GBAKey mapKey(int qtKey);
 
 signals:
@@ -34,8 +34,8 @@ public slots:
 #endif
 
 protected:
-	virtual void keyPressEvent(QKeyEvent* event);
-	virtual void keyReleaseEvent(QKeyEvent* event);
+	virtual void keyPressEvent(QKeyEvent* event) override;
+	virtual void keyReleaseEvent(QKeyEvent* event) override;
 	virtual void closeEvent(QCloseEvent*) override;
 
 private slots: