@@ -53,10 +53,11 @@
 {
 	of_list_object_t *_Nullable _firstListObject;
 	of_list_object_t *_Nullable _lastListObject;
 	size_t _count;
 	unsigned long  _mutations;
+	OF_RESERVE_IVARS(4)
 }
 
 /*!
  * @brief The first list object of the list.
  */