diff --git a/clutter/clutter-stage.h b/clutter/clutter-stage.h
index e331c3fb3..6c8c2a0a0 100644
--- a/clutter/clutter-stage.h
+++ b/clutter/clutter-stage.h
@@ -89,7 +89,7 @@ struct _ClutterStageClass
 
   /*< private >*/
   /* padding for future expansion */
-  gpointer _padding_dummy[31];
+  gpointer _padding_dummy[16];
 };
 
 /**