diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 6ddba4b361fd1690f7abdbac59e2291d8addd401..ab4f7b4f789f2d70b9496d90c4a7441daef6d632 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -858,6 +858,9 @@ int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
 	txtid->paused = true;
 	*ssn = txtid->seq_start = txtid->seq_next;
 
+	memset(txtid->tx_buf, 0, sizeof(txtid->tx_buf));
+	txtid->baw_head = txtid->baw_tail = 0;
+
 	return 0;
 }