@@ -62,9 +62,9 @@
  * @param observer The observer which failed to observe
  * @param errNo The errno of the error that occurred
  * @return An initialized observe failed exception
  */
 - initWithObserver: (OFKernelEventObserver *)observer
-	     errNo: (int)errNo;
+	     errNo: (int)errNo OF_DESIGNATED_INITIALIZER;
 @end
 
 OF_ASSUME_NONNULL_END