diff --git a/gtk/gtkwidget.h b/gtk/gtkwidget.h
index 0bae2c6da5..220e39bcfb 100644
--- a/gtk/gtkwidget.h
+++ b/gtk/gtkwidget.h
@@ -528,9 +528,14 @@ struct _GtkWidgetClass
    */
 
   /* Padding for future expansion */
+  void (*_gtk_reserved1) (void);
+  void (*_gtk_reserved2) (void);
+  void (*_gtk_reserved3) (void);
+  void (*_gtk_reserved4) (void);
   void (*_gtk_reserved5) (void);
   void (*_gtk_reserved6) (void);
   void (*_gtk_reserved7) (void);
+  void (*_gtk_reserved8) (void);
 };
 
 struct _GtkWidgetAuxInfo