diff --git a/sys/dev/bge/if_bge.c b/sys/dev/bge/if_bge.c
index 403dbb5f3ee..b56e099df97 100644
--- a/sys/dev/bge/if_bge.c
+++ b/sys/dev/bge/if_bge.c
@@ -2194,7 +2194,7 @@ bge_attach(dev)
 	IFQ_SET_READY(&ifp->if_snd);
 	ifp->if_hwassist = BGE_CSUM_FEATURES;
 	ifp->if_capabilities = IFCAP_HWCSUM | IFCAP_VLAN_HWTAGGING |
-	    IFCAP_VLAN_MTU;
+	    IFCAP_VLAN_MTU | IFCAP_VLAN_HWCSUM;
 	ifp->if_capenable = ifp->if_capabilities;
 #ifdef DEVICE_POLLING
 	ifp->if_capabilities |= IFCAP_POLLING;
@@ -3519,6 +3519,7 @@ bge_ioctl(ifp, command, data)
 				ifp->if_hwassist = BGE_CSUM_FEATURES;
 			else
 				ifp->if_hwassist = 0;
+			VLAN_CAPABILITIES(ifp);
 		}
 		break;
 	default:
diff --git a/sys/dev/em/if_em.c b/sys/dev/em/if_em.c
index ab6e5b59114..6a24365b28f 100644
--- a/sys/dev/em/if_em.c
+++ b/sys/dev/em/if_em.c
@@ -854,6 +854,7 @@ em_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
 		}
 		if (reinit && (ifp->if_drv_flags & IFF_DRV_RUNNING))
 			em_init(adapter);
+		VLAN_CAPABILITIES(ifp);
 		break;
 	    }
 	default:
@@ -2193,8 +2194,8 @@ em_setup_interface(device_t dev, struct adapter * adapter)
 	ifp->if_capabilities = ifp->if_capenable = 0;
 
 	if (adapter->hw.mac_type >= em_82543) {
-		ifp->if_capabilities |= IFCAP_HWCSUM;
-		ifp->if_capenable |= IFCAP_HWCSUM;
+		ifp->if_capabilities |= IFCAP_HWCSUM | IFCAP_VLAN_HWCSUM;
+		ifp->if_capenable |= IFCAP_HWCSUM | IFCAP_VLAN_HWCSUM;
 	}
 
 	/*