diff --git a/simgear/canvas/CanvasWindow.hxx b/simgear/canvas/CanvasWindow.hxx
index db24bb9c..665a660a 100644
--- a/simgear/canvas/CanvasWindow.hxx
+++ b/simgear/canvas/CanvasWindow.hxx
@@ -68,8 +68,8 @@ namespace canvas
               Element* parent = 0 );
       virtual ~Window();
 
-      virtual void update(double delta_time_sec);
-      virtual void valueChanged(SGPropertyNode* node);
+      void update(double delta_time_sec) override;
+      void valueChanged(SGPropertyNode* node) override;
 
       const SGVec2<float> getPosition() const;
       const SGRect<float>  getScreenRegion() const;
@@ -84,8 +84,8 @@ namespace canvas
       bool isResizable() const;
       bool isCapturingEvents() const;
 
-      virtual void setVisible(bool visible);
-      virtual bool isVisible() const;
+      void setVisible(bool visible) override;
+      bool isVisible() const override;
 
       /**
        * Moves window on top of all other windows with the same z-index.
diff --git a/simgear/io/untar.cxx b/simgear/io/untar.cxx
index 4d825efe..cc70c62f 100644
--- a/simgear/io/untar.cxx
+++ b/simgear/io/untar.cxx
@@ -48,6 +48,8 @@ namespace simgear
 			assert(outer);
 		}
 
+        virtual ~ArchiveExtractorPrivate() = default;
+        
 		typedef enum {
 			INVALID = 0,
 			READING_HEADER,
@@ -614,10 +616,7 @@ ArchiveExtractor::ArchiveExtractor(const SGPath& rootPath) :
 {
 }
 
-ArchiveExtractor::~ArchiveExtractor()
-{
-
-}
+ArchiveExtractor::~ArchiveExtractor() = default;
 
 void ArchiveExtractor::extractBytes(const uint8_t* bytes, size_t count)
 {
diff --git a/simgear/io/untar.hxx b/simgear/io/untar.hxx
index 1b3d9ccc..9760544c 100644
--- a/simgear/io/untar.hxx
+++ b/simgear/io/untar.hxx
@@ -34,7 +34,7 @@ class ArchiveExtractor
 {
 public:
 	ArchiveExtractor(const SGPath& rootPath);
-	~ArchiveExtractor();
+	virtual ~ArchiveExtractor();
 
 	enum DetermineResult
 	{
diff --git a/simgear/scene/model/SGPickAnimation.cxx b/simgear/scene/model/SGPickAnimation.cxx
index 9b9f5249..9f2a9eac 100644
--- a/simgear/scene/model/SGPickAnimation.cxx
+++ b/simgear/scene/model/SGPickAnimation.cxx
@@ -615,9 +615,8 @@ public:
         return false;
     }
     
-    virtual void buttonReleased( int keyModState,
-                                 const osgGA::GUIEventAdapter&,
-                                 const Info* )
+    void buttonReleased( int keyModState, const osgGA::GUIEventAdapter&,
+                                const Info* ) override
     {
         if (!_condition || _condition->test()) {
 
@@ -641,8 +640,7 @@ public:
       return _dragDirection;
   }
   
-    virtual void mouseMoved( const osgGA::GUIEventAdapter& ea,
-                             const Info* )
+    void mouseMoved( const osgGA::GUIEventAdapter& ea, const Info* ) override
     {
         if (!_condition || _condition->test()) {
             _mousePos = eventToWindowCoords(ea);
@@ -675,7 +673,7 @@ public:
         }
     }
     
-    virtual void update(double dt, int keyModState)
+    void update(double dt, int keyModState) override
     {
         if (_hasDragged) {
             return;
@@ -688,8 +686,7 @@ public:
         } // of repeat iteration
     }
 
-    virtual bool hover( const osg::Vec2d& windowPos,
-                        const Info& )
+    bool hover( const osg::Vec2d& windowPos, const Info& ) override
     {
         if (!_condition || _condition->test()) {
 
@@ -711,7 +708,7 @@ public:
       _cursorName = aName;
     }
   
-    virtual std::string getCursor() const
+    std::string getCursor() const override
     { return _cursorName; }
   
 private: