diff --git a/sys/dev/usb/wlan/if_run.c b/sys/dev/usb/wlan/if_run.c
--- a/sys/dev/usb/wlan/if_run.c
+++ b/sys/dev/usb/wlan/if_run.c
@@ -882,6 +882,7 @@
 
 	ic->ic_flags |= IEEE80211_F_DATAPAD;
 	ic->ic_flags_ext |= IEEE80211_FEXT_SWBMISS;
+	ic->ic_flags_ext |= IEEE80211_FEXT_SEQNO_OFFLOAD;
 
 	run_getradiocaps(ic, IEEE80211_CHAN_MAX, &ic->ic_nchans,
 	    ic->ic_channels);
@@ -3522,6 +3523,9 @@
 	data->ni = ni;
 	data->ridx = ridx;
 
+	/* Assign sequence number now, regardless of A-MPDU TX or otherwise (for now) */
+	ieee80211_output_seqno_assign(ni, -1, m);
+
 	run_set_tx_desc(sc, data);
 
 	/*
@@ -3627,6 +3631,9 @@
 	data->ni = ni;
 	data->ridx = ridx;
 
+	/* Assign sequence number now, regardless of A-MPDU TX or otherwise (for now) */
+	ieee80211_output_seqno_assign(ni, -1, m);
+
 	run_set_tx_desc(sc, data);
 
 	RUN_DPRINTF(sc, RUN_DEBUG_XMIT, "sending mgt frame len=%d rate=%d\n",
@@ -3771,6 +3778,9 @@
 			break;
 	data->ridx = ridx;
 
+	/* Assign sequence number now, regardless of A-MPDU TX or otherwise (for now) */
+	ieee80211_output_seqno_assign(ni, -1, m);
+
         run_set_tx_desc(sc, data);
 
         RUN_DPRINTF(sc, RUN_DEBUG_XMIT, "sending raw frame len=%u rate=%u\n",
@@ -6416,6 +6426,10 @@
 {
 
 	/* For now, no A-MPDU TX support in the driver */
+	/*
+	 * TODO: maybe we needed to enable seqno generation too?
+	 * What other TX desc bits are missing/needed?
+	 */
 	return (0);
 }