diff --git a/clutter/clutter-actor.c b/clutter/clutter-actor.c
index 33a58ae45..1d87837e2 100644
--- a/clutter/clutter-actor.c
+++ b/clutter/clutter-actor.c
@@ -11985,7 +11985,7 @@ clutter_actor_get_z_rotation_gravity (ClutterActor *self)
 {
   const ClutterTransformInfo *info;
 
-  g_return_val_if_fail (CLUTTER_IS_ACTOR (self), 0.0);
+  g_return_val_if_fail (CLUTTER_IS_ACTOR (self), CLUTTER_GRAVITY_NONE);
 
   info = _clutter_actor_get_transform_info_or_defaults (self);