diff --git a/sys/dev/lnc/if_lnc.c b/sys/dev/lnc/if_lnc.c
index 960393c8bb2e..d1c6e686f17b 100644
--- a/sys/dev/lnc/if_lnc.c
+++ b/sys/dev/lnc/if_lnc.c
@@ -306,6 +306,7 @@ chain_mbufs(lnc_softc_t *sc, int start_of_packet, int pkt_len)
 
 	head = desc->buff.mbuf;
 	head->m_flags |= M_PKTHDR;
+	bzero(&head->m_pkthdr, sizeof(head->m_pkthdr));
 
 	m = head;
 	do {
diff --git a/sys/dev/vx/if_vx.c b/sys/dev/vx/if_vx.c
index 33f376f0a103..303cd9454783 100644
--- a/sys/dev/vx/if_vx.c
+++ b/sys/dev/vx/if_vx.c
@@ -813,7 +813,7 @@ vxget(sc, totlen)
         sc->next_mb = (sc->next_mb + 1) % MAX_MBS;
         m->m_data = m->m_pktdat;
         m->m_flags = M_PKTHDR;
-        m->m_pkthdr.csum_flags = 0;
+	bzero(&m->m_pkthdr, sizeof(m->m_pkthdr));
     }
     m->m_pkthdr.rcvif = ifp;
     m->m_pkthdr.len = totlen;