diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 00a22683981a..4aca1e5dd712 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -421,6 +421,7 @@ void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif,
 			 u32 changed);
 void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif);
 void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif);
+void ath9k_set_tsfadjust(struct ath_softc *sc, struct ieee80211_vif *vif);
 void ath9k_set_beacon(struct ath_softc *sc);
 void ath9k_set_beaconing_status(struct ath_softc *sc, bool status);
 
diff --git a/drivers/net/wireless/ath/ath9k/beacon.c b/drivers/net/wireless/ath/ath9k/beacon.c
index 02fbd3eebc2b..f2a2131c5ce5 100644
--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -268,6 +268,23 @@ void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
 	tasklet_enable(&sc->bcon_tasklet);
 }
 
+void ath9k_set_tsfadjust(struct ath_softc *sc, struct ieee80211_vif *vif)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
+	struct ath_vif *avp = (void *)vif->drv_priv;
+	u64 tsfadjust;
+
+	if (avp->av_bslot == 0)
+		return;
+
+	tsfadjust = cur_conf->beacon_interval * avp->av_bslot / ATH_BCBUF;
+	avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
+
+	ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n",
+		(unsigned long long)tsfadjust, avp->av_bslot);
+}
+
 void ath_beacon_tasklet(unsigned long data)
 {
 	struct ath_softc *sc = (struct ath_softc *)data;
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index d8ae0f5e3da7..915bd4881b3f 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1531,6 +1531,9 @@ static void ath9k_bss_info_changed(struct ieee80211_hw *hw,
 
 	if ((changed & BSS_CHANGED_BEACON_ENABLED) ||
 	    (changed & BSS_CHANGED_BEACON_INT)) {
+		if (ah->opmode == NL80211_IFTYPE_AP &&
+		    bss_conf->enable_beacon)
+			ath9k_set_tsfadjust(sc, vif);
 		if (ath9k_allow_beacon_config(sc, vif))
 			ath9k_beacon_config(sc, vif, changed);
 	}