diff --git a/include/wx/gtk/private/gtk2-compat.h b/include/wx/gtk/private/gtk2-compat.h
index f3d7e252e7..d9c76861bb 100644
--- a/include/wx/gtk/private/gtk2-compat.h
+++ b/include/wx/gtk/private/gtk2-compat.h
@@ -51,6 +51,7 @@ static inline gpointer wx_g_object_ref_sink(gpointer object)
     gtk_object_sink(GTK_OBJECT(object));
     return object;
 }
+#undef g_object_ref_sink
 #define g_object_ref_sink wx_g_object_ref_sink
 
 // ----------------------------------------------------------------------------