--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -700,7 +700,7 @@ void ath_beacon_config(struct ath_softc 
 	if (cur_conf->dtim_period == 0)
 		cur_conf->dtim_period = 1;
 
-	switch (iftype) {
+	switch (sc->sc_ah->opmode) {
 	case NL80211_IFTYPE_AP:
 		ath_beacon_config_ap(sc, cur_conf);
 		break;