diff --git a/sys/net/if_vlan.c b/sys/net/if_vlan.c
index 03a06f09c54..58df9b21fc2 100644
--- a/sys/net/if_vlan.c
+++ b/sys/net/if_vlan.c
@@ -464,7 +464,7 @@ vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
 	VLAN_XLOCK_ASSERT();
 	KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
 
-	b = 1 << trunk->hwidth;
+	b = 1 << (trunk->hwidth - 1);
 	i = HASH(ifv->ifv_vid, trunk->hmask);
 	CK_SLIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
 		if (ifv2 == ifv) {