diff --git a/sys/net/if_vlan.c b/sys/net/if_vlan.c
index 5f29eb61b470..681d651e7796 100644
--- a/sys/net/if_vlan.c
+++ b/sys/net/if_vlan.c
@@ -1731,6 +1731,16 @@ vlan_capabilities(struct ifvlan *ifv)
 	ena |= (mena & IFCAP_TXRTLMT);
 #endif
 
+	/*
+	 * If the parent interface supports unmapped mbufs, so does
+	 * the VLAN interface.  Note that this should be fine even for
+	 * interfaces that don't support hardware tagging as headers
+	 * are prepended in normal mbufs to unmapped mbufs holding
+	 * payload data.
+	 */
+	cap |= (p->if_capabilities & IFCAP_NOMAP);
+	ena |= (mena & IFCAP_NOMAP);
+
 	ifp->if_capabilities = cap;
 	ifp->if_capenable = ena;
 	ifp->if_hwassist = hwa;