--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -813,7 +813,7 @@ void ath9k_hw_init_global_settings(struc
 	if (conf->channel && conf->channel->band == IEEE80211_BAND_2GHZ)
 		acktimeout += 64 - sifstime - ah->slottime;
 
-	ath9k_hw_setslottime(ah, slottime);
+	ath9k_hw_setslottime(ah, ah->slottime);
 	ath9k_hw_set_ack_timeout(ah, acktimeout);
 	ath9k_hw_set_cts_timeout(ah, acktimeout);
 	if (ah->globaltxtimeout != (u32) -1)