diff --git a/src/osx/carbon/renderer.cpp b/src/osx/carbon/renderer.cpp
index ef77acd907..595a6e94dd 100644
--- a/src/osx/carbon/renderer.cpp
+++ b/src/osx/carbon/renderer.cpp
@@ -104,9 +104,9 @@ public:
     virtual void DrawCollapseButton(wxWindow *win,
                                     wxDC& dc,
                                     const wxRect& rect,
-                                    int flags = 0);
+                                    int flags = 0) wxOVERRIDE;
 
-    virtual wxSize GetCollapseButtonSize(wxWindow *win, wxDC& dc);
+    virtual wxSize GetCollapseButtonSize(wxWindow *win, wxDC& dc) wxOVERRIDE;
 
     virtual void DrawItemSelectionRect(wxWindow *win,
                                        wxDC& dc,
@@ -136,7 +136,7 @@ public:
                            const wxRect& rect,
                            int value,
                            int max,
-                           int flags = 0);
+                           int flags = 0) wxOVERRIDE;
 
     virtual wxSplitterRenderParams GetSplitterParams(const wxWindow *win) wxOVERRIDE;