diff --git a/sys/dev/usb/wlan/if_mtw.c b/sys/dev/usb/wlan/if_mtw.c
--- a/sys/dev/usb/wlan/if_mtw.c
+++ b/sys/dev/usb/wlan/if_mtw.c
@@ -516,7 +516,7 @@
 	struct ieee80211com *ic = &sc->sc_ic;
 	uint32_t ver;
 	int i, ret;
-	//	uint32_t tmp;
+	uint32_t tmp;
 	uint8_t iface_index;
 	int ntries, error;
 
@@ -579,6 +579,11 @@
 		goto detach;
 	}
 
+
+	if (mtw_read(sc, MTW_MAC_VER_ID, &tmp) != 0)
+		goto detach;
+	sc->mac_rev = tmp & 0xffff;
+
 	mtw_load_microcode(sc);
 	ret = msleep(&sc->fwloading, &sc->sc_mtx, 0, "fwload", 3 * hz);
 	if (ret == EWOULDBLOCK || sc->fwloading != 1) {