diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c
index 656f68f..a710825 100644
--- a/fs/nfs/callback_xdr.c
+++ b/fs/nfs/callback_xdr.c
@@ -72,7 +72,7 @@
 	return xdr_ressize_check(rqstp, p);
 }
 
-static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
+static __be32 *read_buf(struct xdr_stream *xdr, size_t nbytes)
 {
 	__be32 *p;