diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index c13b209fad47..b3acfd69380f 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -557,6 +557,9 @@ ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
 		info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 	}
 
+	if (tx->skb->protocol == htons(ETH_P_PREAUTH))
+		info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
+
 	return TX_CONTINUE;
 }