diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index 2197aee2bb72adcd24cb24949a6c82a142dfde7d..a8ac42c96d71c189ae0a0f2e2d60ab7f91f3f074 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -826,9 +826,9 @@ static int ath9k_rx_skb_preprocess(struct ath_softc *sc,
 	sc->rx.discard_next = false;
 
 	/*
-	 * Discard zero-length packets.
+	 * Discard zero-length packets and packets smaller than an ACK
 	 */
-	if (!rx_stats->rs_datalen) {
+	if (rx_stats->rs_datalen < 10) {
 		RX_STAT_INC(rx_len_err);
 		goto corrupt;
 	}