@@ -60,10 +60,14 @@
     OFMessagePackRepresentation>
 #if !defined(OF_HAVE_GENERICS) && !defined(DOXYGEN)
 # define KeyType id
 # define ObjectType id
 #endif
+{
+	OF_RESERVE_IVARS(4)
+}
+
 /*!
  * @brief An array of all keys.
  */
 @property (readonly, nonatomic) OFArray OF_GENERIC(KeyType) *allKeys;