diff --git a/include/wx/gtk/bitmap.h b/include/wx/gtk/bitmap.h
index 42e2d4d4d3..d035f2c2c1 100644
--- a/include/wx/gtk/bitmap.h
+++ b/include/wx/gtk/bitmap.h
@@ -103,7 +103,6 @@ public:
 
     wxMask *GetMask() const;
     void SetMask( wxMask *mask );
-    wxBitmap GetMaskBitmap() const;
 
     wxBitmap GetSubBitmap( const wxRect& rect ) const;