diff --git a/gtk/gtkfilechooserbutton.h b/gtk/gtkfilechooserbutton.h
index b3d9112cf9..fdacc4b6ec 100644
--- a/gtk/gtkfilechooserbutton.h
+++ b/gtk/gtkfilechooserbutton.h
@@ -56,13 +56,13 @@ struct _GtkFileChooserButtonClass
 
   void (* file_set) (GtkFileChooserButton *fc);
 
-  void (*__gtk_reserved1);
-  void (*__gtk_reserved2);
-  void (*__gtk_reserved3);
-  void (*__gtk_reserved4);
-  void (*__gtk_reserved5);
-  void (*__gtk_reserved6);
-  void (*__gtk_reserved7);
+  void *__gtk_reserved1;
+  void *__gtk_reserved2;
+  void *__gtk_reserved3;
+  void *__gtk_reserved4;
+  void *__gtk_reserved5;
+  void *__gtk_reserved6;
+  void *__gtk_reserved7;
 };
 
 
diff --git a/gtk/gtkstatusicon.h b/gtk/gtkstatusicon.h
index 19dbd1cdeb..c45caca5ae 100644
--- a/gtk/gtkstatusicon.h
+++ b/gtk/gtkstatusicon.h
@@ -73,8 +73,8 @@ struct _GtkStatusIconClass
                                      gboolean        keyboard_mode,
                                      GtkTooltip     *tooltip);
 
-  void (*__gtk_reserved1);
-  void (*__gtk_reserved2);
+  void *__gtk_reserved1;
+  void *__gtk_reserved2;
 };
 
 GType                 gtk_status_icon_get_type           (void) G_GNUC_CONST;