diff --git a/sys/netinet6/udp6_usrreq.c b/sys/netinet6/udp6_usrreq.c
index faa6427cf0ae..0d685902bd99 100644
--- a/sys/netinet6/udp6_usrreq.c
+++ b/sys/netinet6/udp6_usrreq.c
@@ -230,7 +230,7 @@ udp6_input(struct mbuf **mp, int *offp, int proto)
 		ulen = plen;
 		cscov_partial = 0;
 	}
-	if (plen != ulen) {
+	if (nxt == IPPROTO_UDP && plen != ulen) {
 		UDPSTAT_INC(udps_badlen);
 		goto badunlocked;
 	}