@@ -33,10 +33,11 @@
 	OFString *_path;
 	REGSAM _accessRights;
 	LPSECURITY_ATTRIBUTES _Nullable _securityAttributes;
 	DWORD _options;
 	LSTATUS _status;
+	OF_RESERVE_IVARS(OFOpenWindowsRegistryKeyFailedException, 4)
 }
 
 /**
  * @brief The registry key on which opening the subkey failed.
  */