diff --git a/gdk/gdkwindowimpl.c b/gdk/gdkwindowimpl.c
index 681aef8cdc..57aed07552 100644
--- a/gdk/gdkwindowimpl.c
+++ b/gdk/gdkwindowimpl.c
@@ -31,7 +31,7 @@
 #include "gdkinternals.h"
 
 
-G_DEFINE_TYPE (GdkWindowImpl, gdk_window_impl, GDK_TYPE_DRAWABLE);
+G_DEFINE_TYPE (GdkWindowImpl, gdk_window_impl, G_TYPE_OBJECT);
 
 
 static void
diff --git a/gdk/gdkwindowimpl.h b/gdk/gdkwindowimpl.h
index 17edbcaad4..6f246ffc88 100644
--- a/gdk/gdkwindowimpl.h
+++ b/gdk/gdkwindowimpl.h
@@ -43,12 +43,12 @@ typedef struct _GdkWindowImplClass  GdkWindowImplClass;
 
 struct _GdkWindowImpl
 {
-  GdkDrawable  parent;
+  GObject parent;
 };
 
 struct _GdkWindowImplClass
 {
-  GdkDrawableClass parent_class;
+  GObjectClass parent_class;
 
   cairo_surface_t *
                (* ref_cairo_surface)    (GdkWindow       *window);