@@ -64,9 +64,9 @@
  * @param type The MessagePack extension type
  * @param data The data for the extension
  * @return An initialized OFMessagePackRepresentation
  */
 - initWithType: (int8_t)type
-	  data: (OFDataArray *)data;
+	  data: (OFDataArray *)data OF_DESIGNATED_INITIALIZER;
 @end
 
 OF_ASSUME_NONNULL_END