@@ -29,11 +29,11 @@
 }
 
 /*!
  * The lock which could not be unlocked.
  */
-@property (readonly, retain) id <OFLocking> lock;
+@property (readonly, nonatomic) id <OFLocking> lock;
 
 /*!
  * @brief Creates a new, autoreleased unlock failed exception.
  *
  * @param lock The lock which could not be unlocked