diff --git a/sys/fs/nfs/nfsproto.h b/sys/fs/nfs/nfsproto.h
index cef886755d5..ca9c732b6a4 100644
--- a/sys/fs/nfs/nfsproto.h
+++ b/sys/fs/nfs/nfsproto.h
@@ -619,6 +619,8 @@
 #define	NFSV4OPEN_WDCONTENTION		0x00100000
 #define	NFSV4OPEN_WDNOTWANTED		0x00200000
 #define	NFSV4OPEN_WDSUPPFTYPE		0x00400000
+#define	NFSV4OPEN_WDNOTSUPPDOWNGRADE	0x00800000
+#define	NFSV4OPEN_WDNOTSUPPUPGRADE	0x01000000
 
 /*
  * NFS V4 File Handle types