diff --git a/include/wx/mac/carbon/window.h b/include/wx/mac/carbon/window.h
index 16d5cfc663..d00ae650e1 100644
--- a/include/wx/mac/carbon/window.h
+++ b/include/wx/mac/carbon/window.h
@@ -310,6 +310,7 @@ protected:
 
     virtual bool        MacIsChildOfClientArea( const wxWindow* child ) const ;
 
+    bool                MacHasScrollBarCorner() const;
     void                MacCreateScrollBars( long style ) ;
     void                MacRepositionScrollBars() ;
     void                MacUpdateControlFont() ;