diff --git a/clutter/clutter-animator.h b/clutter/clutter-animator.h
index 94553575c..1f46799d2 100644
--- a/clutter/clutter-animator.h
+++ b/clutter/clutter-animator.h
@@ -117,7 +117,7 @@ void                 clutter_animator_set                        (ClutterAnimato
                                                                   const gchar          *first_property_name,
                                                                   guint                 first_mode,
                                                                   gdouble               first_progress,
-                                                                  ...);
+                                                                  ...) G_GNUC_NULL_TERMINATED;
 GList              * clutter_animator_get_keys                   (ClutterAnimator      *animator,
                                                                   GObject              *object,
                                                                   const gchar          *property_name,
diff --git a/clutter/clutter-state.h b/clutter/clutter-state.h
index 771db1116..457c3ed72 100644
--- a/clutter/clutter-state.h
+++ b/clutter/clutter-state.h
@@ -116,7 +116,7 @@ void              clutter_state_set                  (ClutterState    *state,
                                                       gpointer         first_object,
                                                       const gchar     *first_property_name,
                                                       gulong           first_mode,
-                                                       ...);
+                                                       ...) G_GNUC_NULL_TERMINATED;
 GList           * clutter_state_get_states           (ClutterState    *state);
 GList           * clutter_state_get_keys             (ClutterState    *state,
                                                       const gchar     *source_state_name,