diff --git a/gtk/gtkmodelmenu.h b/gtk/gtkmodelmenu.h
index e1f388bcb0..77c72b555a 100644
--- a/gtk/gtkmodelmenu.h
+++ b/gtk/gtkmodelmenu.h
@@ -27,12 +27,14 @@
 #include <gtk/gtkaccelgroup.h>
 #include <gio/gio.h>
 
-GtkWidget *             gtk_model_menu_create_menu_bar                  (GMenuModel        *model,
-                                                                         GActionObservable *actions,
-                                                                         GtkAccelGroup     *accels);
+G_GNUC_INTERNAL
+GtkWidget * gtk_model_menu_create_menu_bar (GMenuModel        *model,
+                                            GActionObservable *actions,
+                                            GtkAccelGroup     *accels);
 
-GtkWidget *             gtk_model_menu_create_menu                      (GMenuModel        *model,
-                                                                         GActionObservable *actions,
-                                                                         GtkAccelGroup     *accels);
+G_GNUC_INTERNAL
+GtkWidget * gtk_model_menu_create_menu     (GMenuModel        *model,
+                                            GActionObservable *actions,
+                                            GtkAccelGroup     *accels);
 
 #endif /* __GTK_MODEL_MENU_H__ */