diff --git a/clutter/clutter-actor.c b/clutter/clutter-actor.c
index 5333fc452..956f7b55b 100644
--- a/clutter/clutter-actor.c
+++ b/clutter/clutter-actor.c
@@ -1923,7 +1923,7 @@ clutter_actor_transform_vertices_relative (ClutterActor  *self,
 static void
 clutter_actor_transform_and_project_box (ClutterActor          *self,
 					 const ClutterActorBox *box,
-					 ClutterVertex          verts[4])
+					 ClutterVertex          verts[])
 {
   ClutterActor *stage;
   CoglMatrix mtx;
@@ -2003,7 +2003,7 @@ clutter_actor_transform_and_project_box (ClutterActor          *self,
 void
 clutter_actor_get_allocation_vertices (ClutterActor  *self,
                                        ClutterActor  *ancestor,
-                                       ClutterVertex  verts[4])
+                                       ClutterVertex  verts[])
 {
   ClutterActorPrivate *priv;
   ClutterActor *stage;
@@ -2089,7 +2089,7 @@ clutter_actor_get_allocation_vertices (ClutterActor  *self,
  */
 void
 clutter_actor_get_abs_allocation_vertices (ClutterActor  *self,
-                                           ClutterVertex  verts[4])
+                                           ClutterVertex  verts[])
 {
   ClutterActorPrivate   *priv;
 
diff --git a/clutter/clutter-actor.h b/clutter/clutter-actor.h
index 18f776685..bd3407b71 100644
--- a/clutter/clutter-actor.h
+++ b/clutter/clutter-actor.h
@@ -328,7 +328,7 @@ void                  clutter_actor_get_allocation_geometry   (ClutterActor
                                                                ClutterGeometry       *geom);
 void                  clutter_actor_get_allocation_vertices   (ClutterActor          *self,
 							       ClutterActor          *ancestor,
-                                                               ClutterVertex          verts[4]);
+                                                               ClutterVertex          verts[]);
 void                  clutter_actor_set_geometry              (ClutterActor          *self,
                                                                const ClutterGeometry *geometry);
 void                  clutter_actor_get_geometry              (ClutterActor          *self,
@@ -500,7 +500,7 @@ gboolean clutter_actor_is_scaled                      (ClutterActor   *self);
 gboolean clutter_actor_should_pick_paint              (ClutterActor   *self);
 
 void clutter_actor_get_abs_allocation_vertices        (ClutterActor        *self,
-                                                       ClutterVertex        verts[4]);
+                                                       ClutterVertex        verts[]);
 
 void clutter_actor_apply_transform_to_point           (ClutterActor        *self,
                                                        const ClutterVertex *point,