Index: sys/dev/usb/wlan/if_run.c
===================================================================
--- sys/dev/usb/wlan/if_run.c
+++ sys/dev/usb/wlan/if_run.c
@@ -2791,7 +2791,8 @@
 
 	wh = mtod(m, struct ieee80211_frame *);
 
-	if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
+	if ((wh->i_fc[1] & IEEE80211_FC1_PROTECTED) &&
+	    (flags & RT2860_RX_DEC)) {
 		wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 		m->m_flags |= M_WEP;
 	}