diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index d4b9d09..14ba4d9 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1160,11 +1160,11 @@
 	*p++ = htonl((u32)((n) >> 32));				\
 	*p++ = htonl((u32)(n));					\
 } while (0)
-#define WRITEMEM(ptr,nbytes)     do if (nbytes > 0) {		\
+#define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {		\
 	*(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
 	memcpy(p, ptr, nbytes);					\
 	p += XDR_QUADLEN(nbytes);				\
-} while (0)
+}} while (0)
 #define WRITECINFO(c)		do {				\
 	*p++ = htonl(c.atomic);					\
 	*p++ = htonl(c.before_ctime_sec);				\