@@ -127,11 +127,12 @@
 	OFMutex *_mutex;
 #endif
 }
 
 #ifdef OF_HAVE_PROPERTIES
-@property (assign, nullable) id <OFKernelEventObserverDelegate> delegate;
+@property OF_NULLABLE_PROPERTY (assign)
+    id <OFKernelEventObserverDelegate> delegate;
 #endif
 
 /*!
  * @brief Creates a new OFKernelEventObserver.
  *