diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 08f51c6d0953a4cd670de5b203fbf87ff1589f6c..93af0f1c9d991a52d82cbc58bcd842415b22a04a 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1168,7 +1168,8 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
 	else
 		mod_timer(&ifmgd->chswitch_timer,
-			  TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
+			  TU_TO_EXP_TIME((csa_ie.count - 1) *
+					 cbss->beacon_interval));
 }
 
 static bool