@@ -31,10 +31,11 @@
  */
 @interface OFThreadStartFailedException: OFException
 {
 	OFThread *_Nullable _thread;
 	int _errNo;
+	OF_RESERVE_IVARS(OFThreadStartFailedException, 4)
 }
 
 /**
  * @brief The thread which could not be started.
  */