diff --git a/gdk/gdkinternals.h b/gdk/gdkinternals.h
index 954be905a5..6010396af8 100644
--- a/gdk/gdkinternals.h
+++ b/gdk/gdkinternals.h
@@ -321,10 +321,6 @@ void _gdk_windowing_event_data_copy (const GdkEvent *src,
                                      GdkEvent       *dst);
 void _gdk_windowing_event_data_free (GdkEvent       *event);
 
-void gdk_synthesize_window_state (GdkWindow     *window,
-                                  GdkWindowState unset_flags,
-                                  GdkWindowState set_flags);
-
 gboolean _gdk_cairo_surface_extents (cairo_surface_t *surface,
                                      GdkRectangle *extents);
 
diff --git a/gtk/gtkplug.c b/gtk/gtkplug.c
index 53c6f3eed6..c45b31b2aa 100644
--- a/gtk/gtkplug.c
+++ b/gtk/gtkplug.c
@@ -1118,7 +1118,7 @@ gtk_plug_hide (GtkWidget *widget)
     GTK_WIDGET_CLASS (bin_class)->hide (widget);
 }
 
-/* From gdkinternals.h */
+/* From gdkprivate.h */
 void gdk_synthesize_window_state (GdkWindow     *window,
                                   GdkWindowState unset_flags,
                                   GdkWindowState set_flags);