diff --git a/sys/netinet/ip_divert.c b/sys/netinet/ip_divert.c
--- a/sys/netinet/ip_divert.c
+++ b/sys/netinet/ip_divert.c
@@ -227,6 +227,25 @@
 		m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 	}
 #endif
+#ifdef INET6
+	if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
+		m = mb_unmapped_to_ext(m);
+		if (m == NULL)
+			return;
+		in6_delayed_cksum(m, m->m_pkthdr.len -
+		    sizeof(struct ip6_hdr), sizeof(struct ip6_hdr));
+		m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
+	}
+#if defined(SCTP) || defined(SCTP_SUPPORT)
+	if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
+		m = mb_unmapped_to_ext(m);
+		if (m == NULL)
+			return;
+		sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
+		m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
+	}
+#endif
+#endif /* INET6 */
 	bzero(&divsrc, sizeof(divsrc));
 	divsrc.sin_len = sizeof(divsrc);
 	divsrc.sin_family = AF_INET;