diff --git a/gtk/gtkhbbox.h b/gtk/gtkhbbox.h
index f0aec6e8dd..c6f9023bed 100644
--- a/gtk/gtkhbbox.h
+++ b/gtk/gtkhbbox.h
@@ -62,11 +62,6 @@ struct _GtkHButtonBoxClass
 GType      gtk_hbutton_box_get_type (void) G_GNUC_CONST;
 GtkWidget* gtk_hbutton_box_new      (void);
 
-/* buttons can be added by gtk_container_add() */
-
-/* private API */
-GtkButtonBoxStyle _gtk_hbutton_box_get_layout_default (void);
-
 G_END_DECLS
 
 #endif /* __GTK_HBUTTON_BOX_H__ */
diff --git a/gtk/gtkvbbox.h b/gtk/gtkvbbox.h
index c21be52303..3c91a2e6bb 100644
--- a/gtk/gtkvbbox.h
+++ b/gtk/gtkvbbox.h
@@ -63,11 +63,6 @@ struct _GtkVButtonBoxClass
 GType      gtk_vbutton_box_get_type (void) G_GNUC_CONST;
 GtkWidget *gtk_vbutton_box_new      (void);
 
-
-/* private API */
-GtkButtonBoxStyle _gtk_vbutton_box_get_layout_default (void);
-
-
 G_END_DECLS
 
 #endif /* __GTK_VBBOX_H__ */