diff --git a/sys/fs/nfsclient/nfs_clport.c b/sys/fs/nfsclient/nfs_clport.c
index 413cb0e1bc42..1a1b9b9400bc 100644
--- a/sys/fs/nfsclient/nfs_clport.c
+++ b/sys/fs/nfsclient/nfs_clport.c
@@ -1196,7 +1196,7 @@ nfscl_maperr(struct thread *td, int error, uid_t uid, gid_t gid)
 {
 	struct proc *p;
 
-	if (error < 10000)
+	if (error < 10000 || error >= NFSERR_STALEWRITEVERF)
 		return (error);
 	if (td != NULL)
 		p = td->td_proc;