diff --git a/sys/net/if_vlan.c b/sys/net/if_vlan.c
index 75699fb8ff25..00d99ed777bf 100644
--- a/sys/net/if_vlan.c
+++ b/sys/net/if_vlan.c
@@ -1511,6 +1511,8 @@ vlan_capabilities(struct ifvlan *ifv)
 	 * propagate the hardware-assisted flag. TSO on VLANs
 	 * does not necessarily require hardware VLAN tagging.
 	 */
+	if (p->if_hw_tsomax > 0)
+		ifp->if_hw_tsomax = p->if_hw_tsomax;
 	if (p->if_capabilities & IFCAP_VLAN_HWTSO)
 		ifp->if_capabilities |= p->if_capabilities & IFCAP_TSO;
 	if (p->if_capenable & IFCAP_VLAN_HWTSO) {