diff --git a/sys/dev/usb/wlan/if_uath.c b/sys/dev/usb/wlan/if_uath.c
--- a/sys/dev/usb/wlan/if_uath.c
+++ b/sys/dev/usb/wlan/if_uath.c
@@ -1830,6 +1830,8 @@
 		UATH_UNLOCK(sc);
 		return;
 	}
+	/* flush data & control requests into the target  */
+	(void)uath_flush(sc);
 	(void)uath_switch_channel(sc, ic->ic_curchan);
 	UATH_UNLOCK(sc);
 }
@@ -2014,6 +2016,8 @@
 		break;
 
 	case IEEE80211_S_AUTH:
+		/* flush data & control requests into the target  */
+		(void)uath_flush(sc);
 		/* XXX good place?  set RTS threshold  */
 		uath_config(sc, CFG_USER_RTS_THRESHOLD, vap->iv_rtsthreshold);
 		/* XXX bad place  */