diff --git a/sys/dev/usb/wlan/if_rum.c b/sys/dev/usb/wlan/if_rum.c
index b164ef22008..1bc30837743 100644
--- a/sys/dev/usb/wlan/if_rum.c
+++ b/sys/dev/usb/wlan/if_rum.c
@@ -172,7 +172,6 @@ static void		rum_enable_tsf_sync(struct rum_softc *);
 static void		rum_update_slot(struct ifnet *);
 static void		rum_set_bssid(struct rum_softc *, const uint8_t *);
 static void		rum_set_macaddr(struct rum_softc *, const uint8_t *);
-static void		rum_update_mcast(struct ifnet *);
 static void		rum_update_promisc(struct ifnet *);
 static const char	*rum_get_rf(int);
 static void		rum_read_eeprom(struct rum_softc *);
@@ -518,7 +517,6 @@ rum_attach_post(struct usb2_proc_msg *pm)
 	ieee80211_init_channels(ic, NULL, &bands);
 
 	ieee80211_ifattach(ic);
-	ic->ic_update_mcast = rum_update_mcast;
 	ic->ic_update_promisc = rum_update_promisc;
 	ic->ic_newassoc = rum_newassoc;
 	ic->ic_raw_xmit = rum_raw_xmit;
@@ -1873,12 +1871,6 @@ rum_promisctask(struct usb2_proc_msg *pm)
 	    "entering" : "leaving");
 }
 
-static void
-rum_update_mcast(struct ifnet *ifp)
-{
-	/* not supported */
-}
-
 static void
 rum_update_promisc(struct ifnet *ifp)
 {
diff --git a/sys/dev/usb/wlan/if_ural.c b/sys/dev/usb/wlan/if_ural.c
index 8db1bdab6cb..28990dadf22 100644
--- a/sys/dev/usb/wlan/if_ural.c
+++ b/sys/dev/usb/wlan/if_ural.c
@@ -155,7 +155,6 @@ static void		ural_set_basicrates(struct ural_softc *,
 			    const struct ieee80211_channel *);
 static void		ural_set_bssid(struct ural_softc *, const uint8_t *);
 static void		ural_set_macaddr(struct ural_softc *, uint8_t *);
-static void		ural_update_mcast(struct ifnet *);
 static void		ural_update_promisc(struct ifnet *);
 static const char	*ural_get_rf(int);
 static void		ural_read_eeprom(struct ural_softc *);
@@ -509,7 +508,6 @@ ural_attach_post(struct usb2_proc_msg *pm)
 	ieee80211_init_channels(ic, NULL, &bands);
 
 	ieee80211_ifattach(ic);
-	ic->ic_update_mcast = ural_update_mcast;
 	ic->ic_update_promisc = ural_update_promisc;
 	ic->ic_newassoc = ural_newassoc;
 	ic->ic_raw_xmit = ural_raw_xmit;
@@ -2026,12 +2024,6 @@ ural_promisctask(struct usb2_proc_msg *pm)
 	    "entering" : "leaving");
 }
 
-static void
-ural_update_mcast(struct ifnet *ifp)
-{
-	/* not supported */
-}
-
 static void
 ural_update_promisc(struct ifnet *ifp)
 {