diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index ad192d25724c..2cd921109abf 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -244,7 +244,7 @@ nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
 		return nfserr_bad_xdr;
 	p = xdr_decode_hyper(p, &tv->tv_sec);
 	tv->tv_nsec = be32_to_cpup(p++);
-	if (tv->tv_nsec >= (u32)1000000000)
+	if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
 		return nfserr_inval;
 	return nfs_ok;
 }