diff --git a/sys/netinet6/raw_ip6.c b/sys/netinet6/raw_ip6.c
index e07ca80e07b5..59bb4a5afdf9 100644
--- a/sys/netinet6/raw_ip6.c
+++ b/sys/netinet6/raw_ip6.c
@@ -167,7 +167,7 @@ rip6_input(mp, offp, proto)
 			goto docontinue;
 		if (in6p->in6p_cksum != -1) {
 			rip6stat.rip6s_isum++;
-			if (in6_cksum(m, ip6->ip6_nxt, *offp,
+			if (in6_cksum(m, proto, *offp,
 			    m->m_pkthdr.len - *offp)) {
 				rip6stat.rip6s_badsum++;
 				goto docontinue;