diff --git a/usr.sbin/ndp/ndp.c b/usr.sbin/ndp/ndp.c
index 1a3b16ff77d8..96e8c149a2f2 100644
--- a/usr.sbin/ndp/ndp.c
+++ b/usr.sbin/ndp/ndp.c
@@ -884,22 +884,26 @@ rtmsg(cmd)
 			rtm->rtm_inits = RTV_EXPIRE;
 		}
 		rtm->rtm_flags |= (RTF_HOST | RTF_STATIC);
+#if 0 /* we don't support ipv6addr/128 type proxying */
 		if (rtm->rtm_flags & RTF_ANNOUNCE) {
 			rtm->rtm_flags &= ~RTF_HOST;
 			rtm->rtm_addrs |= RTA_NETMASK;
 		}
+#endif
 		/* FALLTHROUGH */
 	case RTM_GET:
 		rtm->rtm_addrs |= RTA_DST;
 	}
 #define NEXTADDR(w, s) \
 	if (rtm->rtm_addrs & (w)) { \
-		bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);}
+		bcopy((char *)&s, cp, sizeof(s)); cp += SA_SIZE(&s);}
 
 	NEXTADDR(RTA_DST, sin_m);
 	NEXTADDR(RTA_GATEWAY, sdl_m);
+#if 0 /* we don't support ipv6addr/128 type proxying */
 	memset(&so_mask.sin6_addr, 0xff, sizeof(so_mask.sin6_addr));
 	NEXTADDR(RTA_NETMASK, so_mask);
+#endif
 
 	rtm->rtm_msglen = cp - (char *)&m_rtmsg;
 doit: