@@ -28,10 +28,11 @@
  *	  supported.
  */
 @interface OFUnsupportedProtocolException: OFException
 {
 	OFURL *_Nullable _URL;
+	OF_RESERVE_IVARS(OFUnsupportedProtocolException, 4)
 }
 
 /**
  * @brief The URL whose protocol is unsupported.
  */