diff --git a/core/sys/windows/winerror.odin b/core/sys/windows/winerror.odin
index fee04fdc4..23467761d 100644
--- a/core/sys/windows/winerror.odin
+++ b/core/sys/windows/winerror.odin
@@ -222,6 +222,7 @@ ERROR_LOCK_FAILED            : DWORD : 167
 ERROR_ALREADY_EXISTS         : DWORD : 183
 ERROR_NO_DATA                : DWORD : 232
 ERROR_ENVVAR_NOT_FOUND       : DWORD : 203
+ERROR_MR_MID_NOT_FOUND       : DWORD : 317
 ERROR_OPERATION_ABORTED      : DWORD : 995
 ERROR_IO_PENDING             : DWORD : 997
 ERROR_NO_UNICODE_TRANSLATION : DWORD : 1113