diff --git a/fs/nfs/nfs42xdr.c b/fs/nfs/nfs42xdr.c
index fe1aeb0f048f2b73bf2fbc92d0771fefac1b1716..2fd465cab631d28c9041e78687ebbf760a193177 100644
--- a/fs/nfs/nfs42xdr.c
+++ b/fs/nfs/nfs42xdr.c
@@ -1142,7 +1142,7 @@ static int decode_read_plus(struct xdr_stream *xdr, struct nfs_pgio_res *res)
 	if (!segs)
 		return -ENOMEM;
 
-	xdr_set_scratch_buffer(xdr, &scratch_buf, 32);
+	xdr_set_scratch_buffer(xdr, &scratch_buf, sizeof(scratch_buf));
 	status = -EIO;
 	for (i = 0; i < segments; i++) {
 		status = decode_read_plus_segment(xdr, &segs[i]);