Index: usr.sbin/mountd/mountd.c
===================================================================
--- usr.sbin/mountd/mountd.c	20 Dec 2010 09:28:28 -0000	1.107
+++ usr.sbin/mountd/mountd.c	1 Mar 2011 11:47:16 -0000	1.108
@@ -2875,7 +2875,7 @@ makemask(struct sockaddr_storage *ssp, i
 
 	for (i = 0; i < len; i++) {
 		bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen;
-		*p++ = (1 << bits) - 1;
+		*p++ = (u_char)~0 << (CHAR_BIT - bits);
 		bitlen -= bits;
 	}
 	return 0;