diff --git a/include/wx/osx/glcanvas.h b/include/wx/osx/glcanvas.h
index 3bc6e1c5ce..03c122412f 100644
--- a/include/wx/osx/glcanvas.h
+++ b/include/wx/osx/glcanvas.h
@@ -73,7 +73,7 @@ public:
     virtual ~wxGLCanvas();
 
     // implement wxGLCanvasBase methods
-    virtual bool SwapBuffers();
+    virtual bool SwapBuffers() wxOVERRIDE;
 
 
     // Mac-specific functions