@@ -95,9 +95,9 @@
  * @param errNo The errno of the error that occurred
  * @return A new open file failed exception
  */
 -  initWithObject: (id)object
   requestedLength: (size_t)requestedLength
-	    errNo: (int)errNo;
+	    errNo: (int)errNo OF_DESIGNATED_INITIALIZER;
 @end
 
 OF_ASSUME_NONNULL_END