@@ -54,9 +54,9 @@
  * @brief Initializes an already allocated unsupported protocol exception
  *
  * @param URL The URL whose protocol is unsupported
  * @return An initialized unsupported protocol exception
  */
-- initWithURL: (OFURL*)URL;
+- initWithURL: (OFURL*)URL OF_DESIGNATED_INITIALIZER;
 @end
 
 OF_ASSUME_NONNULL_END