diff --git a/drivers/net/wireless/ath/carl9170/main.c b/drivers/net/wireless/ath/carl9170/main.c
index 202f421e0e37..1ea80d004d46 100644
--- a/drivers/net/wireless/ath/carl9170/main.c
+++ b/drivers/net/wireless/ath/carl9170/main.c
@@ -1920,7 +1920,7 @@ static int carl9170_parse_eeprom(struct ar9170 *ar)
 		WARN_ON(!(tx_streams >= 1 && tx_streams <=
 			IEEE80211_HT_MCS_TX_MAX_STREAMS));
 
-		tx_params = (tx_streams - 1) <<
+		tx_params |= (tx_streams - 1) <<
 			    IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
 
 		carl9170_band_2GHz.ht_cap.mcs.tx_params |= tx_params;