diff --git a/src/engine/channels/engineaux.h b/src/engine/channels/engineaux.h
index 5934ca5fec02..72a171035c6c 100644
--- a/src/engine/channels/engineaux.h
+++ b/src/engine/channels/engineaux.h
@@ -16,31 +16,33 @@ class EngineAux : public EngineChannel, public AudioDestination {
     Q_OBJECT
   public:
     EngineAux(const ChannelHandleAndGroup& handleGroup, EffectsManager* pEffectsManager);
-    virtual ~EngineAux();
+    ~EngineAux() override;
 
     ActiveState updateActiveState() override;
 
     /// Called by EngineMaster whenever is requesting a new buffer of audio.
-    virtual void process(CSAMPLE* pOutput, const int iBufferSize);
-    virtual void collectFeatures(GroupFeatureState* pGroupFeatures) const;
-    virtual void postProcess(const int iBufferSize) { Q_UNUSED(iBufferSize) }
+    void process(CSAMPLE* pOutput, const int iBufferSize) override;
+    void collectFeatures(GroupFeatureState* pGroupFeatures) const override;
+    void postProcess(const int iBufferSize) override {
+        Q_UNUSED(iBufferSize)
+    }
 
     /// This is called by SoundManager whenever there are new samples from the
     /// configured input to be processed. This is run in the callback thread of
     /// the soundcard this AudioDestination was registered for! Beware, in the
     /// case of multiple soundcards, this method is not re-entrant but it may be
     /// concurrent with EngineMaster processing.
-    virtual void receiveBuffer(const AudioInput& input,
+    void receiveBuffer(const AudioInput& input,
             const CSAMPLE* pBuffer,
-            unsigned int nFrames);
+            unsigned int nFrames) override;
 
     /// Called by SoundManager whenever the aux input is connected to a
     /// soundcard input.
-    virtual void onInputConfigured(const AudioInput& input);
+    void onInputConfigured(const AudioInput& input) override;
 
     /// Called by SoundManager whenever the aux input is disconnected from
     /// a soundcard input.
-    virtual void onInputUnconfigured(const AudioInput& input);
+    void onInputUnconfigured(const AudioInput& input) override;
 
   private:
     QScopedPointer<ControlObject> m_pInputConfigured;
diff --git a/src/engine/channels/enginechannel.h b/src/engine/channels/enginechannel.h
index 6ea7c910406c..2f832201f6f2 100644
--- a/src/engine/channels/enginechannel.h
+++ b/src/engine/channels/enginechannel.h
@@ -32,7 +32,7 @@ class EngineChannel : public EngineObject {
             EffectsManager* pEffectsManager,
             bool isTalkoverChannel,
             bool isPrimaryDeck);
-    virtual ~EngineChannel();
+    ~EngineChannel() override;
 
     virtual ChannelOrientation getOrientation() const;
 
@@ -72,7 +72,7 @@ class EngineChannel : public EngineObject {
 
     // TODO(XXX) This hack needs to be removed.
     virtual EngineBuffer* getEngineBuffer() {
-        return NULL;
+        return nullptr;
     }
 
   protected:
diff --git a/src/engine/channels/enginedeck.h b/src/engine/channels/enginedeck.h
index 50f61ec86227..3bdb13abcb41 100644
--- a/src/engine/channels/enginedeck.h
+++ b/src/engine/channels/enginedeck.h
@@ -29,14 +29,14 @@ class EngineDeck : public EngineChannel, public AudioDestination {
             EffectsManager* pEffectsManager,
             EngineChannel::ChannelOrientation defaultOrientation,
             bool primaryDeck);
-    virtual ~EngineDeck();
+    ~EngineDeck() override;
 
-    virtual void process(CSAMPLE* pOutput, const int iBufferSize);
-    virtual void collectFeatures(GroupFeatureState* pGroupFeatures) const;
-    virtual void postProcess(const int iBufferSize);
+    void process(CSAMPLE* pOutput, const int iBufferSize) override;
+    void collectFeatures(GroupFeatureState* pGroupFeatures) const override;
+    void postProcess(const int iBufferSize) override;
 
     // TODO(XXX) This hack needs to be removed.
-    virtual EngineBuffer* getEngineBuffer();
+    EngineBuffer* getEngineBuffer() override;
 
     EngineChannel::ActiveState updateActiveState() override;
 
@@ -45,17 +45,17 @@ class EngineDeck : public EngineChannel, public AudioDestination {
     // the soundcard this AudioDestination was registered for! Beware, in the
     // case of multiple soundcards, this method is not re-entrant but it may be
     // concurrent with EngineMaster processing.
-    virtual void receiveBuffer(const AudioInput& input,
+    void receiveBuffer(const AudioInput& input,
             const CSAMPLE* pBuffer,
-            unsigned int nFrames);
+            unsigned int nFrames) override;
 
     // Called by SoundManager whenever the passthrough input is connected to a
     // soundcard input.
-    virtual void onInputConfigured(const AudioInput& input);
+    void onInputConfigured(const AudioInput& input) override;
 
     // Called by SoundManager whenever the passthrough input is disconnected
     // from a soundcard input.
-    virtual void onInputUnconfigured(const AudioInput& input);
+    void onInputUnconfigured(const AudioInput& input) override;
 
     // Return whether or not passthrough is active
     bool isPassthroughActive() const;
diff --git a/src/engine/channels/enginemicrophone.h b/src/engine/channels/enginemicrophone.h
index 789be15cf136..8133344ef6fc 100644
--- a/src/engine/channels/enginemicrophone.h
+++ b/src/engine/channels/enginemicrophone.h
@@ -20,31 +20,33 @@ class EngineMicrophone : public EngineChannel, public AudioDestination {
   public:
     EngineMicrophone(const ChannelHandleAndGroup& handleGroup,
             EffectsManager* pEffectsManager);
-    virtual ~EngineMicrophone();
+    ~EngineMicrophone() override;
 
     ActiveState updateActiveState();
 
     // Called by EngineMaster whenever is requesting a new buffer of audio.
-    virtual void process(CSAMPLE* pOutput, const int iBufferSize);
-    virtual void collectFeatures(GroupFeatureState* pGroupFeatures) const;
-    virtual void postProcess(const int iBufferSize) { Q_UNUSED(iBufferSize) }
+    void process(CSAMPLE* pOutput, const int iBufferSize) override;
+    void collectFeatures(GroupFeatureState* pGroupFeatures) const override;
+    void postProcess(const int iBufferSize) override {
+        Q_UNUSED(iBufferSize)
+    }
 
     // This is called by SoundManager whenever there are new samples from the
     // configured input to be processed. This is run in the callback thread of
     // the soundcard this AudioDestination was registered for! Beware, in the
     // case of multiple soundcards, this method is not re-entrant but it may be
     // concurrent with EngineMaster processing.
-    virtual void receiveBuffer(const AudioInput& input,
+    void receiveBuffer(const AudioInput& input,
             const CSAMPLE* pBuffer,
-            unsigned int iNumSamples);
+            unsigned int iNumSamples) override;
 
     // Called by SoundManager whenever the microphone input is connected to a
     // soundcard input.
-    virtual void onInputConfigured(const AudioInput& input);
+    void onInputConfigured(const AudioInput& input) override;
 
     // Called by SoundManager whenever the microphone input is disconnected from
     // a soundcard input.
-    virtual void onInputUnconfigured(const AudioInput& input);
+    void onInputUnconfigured(const AudioInput& input) override;
 
     bool isSolo();
     double getSoloDamping();
diff --git a/src/engine/engineobject.h b/src/engine/engineobject.h
index 88de2c7e492f..3c5c4c443b5c 100644
--- a/src/engine/engineobject.h
+++ b/src/engine/engineobject.h
@@ -9,7 +9,7 @@ class EngineObject : public QObject {
     Q_OBJECT
   public:
     EngineObject();
-    virtual ~EngineObject();
+    ~EngineObject() override;
     virtual void process(CSAMPLE* pInOut,
                          const int iBufferSize) = 0;
 
@@ -24,7 +24,7 @@ class EngineObjectConstIn : public QObject {
     Q_OBJECT
   public:
     EngineObjectConstIn();
-    virtual ~EngineObjectConstIn();
+    ~EngineObjectConstIn() override;
 
     virtual void process(const CSAMPLE* pIn, CSAMPLE* pOut,
                          const int iBufferSize) = 0;