@@ -26,10 +26,11 @@
  */
 @interface OFUnlockFailedException: OFException
 {
 	id <OFLocking> _Nullable _lock;
 	int _errNo;
+	OF_RESERVE_IVARS(OFUnlockFailedException, 4)
 }
 
 /**
  * @brief The lock which could not be unlocked.
  */