diff --git a/include/net/ieee80211.h b/include/net/ieee80211.h
index cb255432e4e486f0f7d1e49861fe4776f60aca50..e6af381e206db9e7ac6682b5b0c7fc9c1ae301db 100644
--- a/include/net/ieee80211.h
+++ b/include/net/ieee80211.h
@@ -1080,6 +1080,8 @@ struct ieee80211_device {
 	int perfect_rssi;
 	int worst_rssi;
 
+	u16 prev_seq_ctl;	/* used to drop duplicate frames */
+
 	/* Callback functions */
 	void (*set_security) (struct net_device * dev,
 			      struct ieee80211_security * sec);
diff --git a/net/ieee80211/ieee80211_rx.c b/net/ieee80211/ieee80211_rx.c
index d9265195656da0c97aa6a8c3ac938e22cb992731..ce28d571afac142e708829b48f41f3ecfcb0251b 100644
--- a/net/ieee80211/ieee80211_rx.c
+++ b/net/ieee80211/ieee80211_rx.c
@@ -478,6 +478,11 @@ int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
 			goto rx_exit;
 	}
 #endif
+	/* drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.29) */
+	if (sc == ieee->prev_seq_ctl)
+		goto rx_dropped;
+	else
+		ieee->prev_seq_ctl = sc;
 
 	/* Data frame - extract src/dst addresses */
 	if (skb->len < IEEE80211_3ADDR_LEN)