--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -417,7 +417,7 @@ static void ath9k_hw_init_defaults(struc
 		AR_STA_ID1_MCAST_KSRCH;
 	ah->beacon_interval = 100;
 	ah->enable_32kHz_clock = DONT_USE_32KHZ;
-	ah->slottime = (u32) -1;
+	ah->slottime = 9;
 	ah->globaltxtimeout = (u32) -1;
 	ah->power_mode = ATH9K_PM_UNDEFINED;
 }