diff --git a/sys/dev/rtwn/if_rtwn.c b/sys/dev/rtwn/if_rtwn.c
--- a/sys/dev/rtwn/if_rtwn.c
+++ b/sys/dev/rtwn/if_rtwn.c
@@ -1618,6 +1618,16 @@
 	/* XXX workaround add_channel_list() limitations */
 	setbit(bands, IEEE80211_MODE_11A);
 	setbit(bands, IEEE80211_MODE_11NA);
+
+	if (ic->ic_flags_ext & IEEE80211_FEXT_VHT) {
+		device_printf(sc->sc_dev, "%s: enabling 5GHz VHT\n",
+		    __func__);
+		setbit(bands, IEEE80211_MODE_VHT_5GHZ);
+	}
+
+	/* Only enable VHT80 if HT40/VHT40 is available */
+	cbw_flags |= sc->sc_ht40 ? NET80211_CBW_FLAG_VHT80 : 0;
+
 	for (i = 0; i < nitems(sc->chan_num_5ghz); i++) {
 		if (sc->chan_num_5ghz[i] == 0)
 			continue;