diff --git a/sys/net80211/ieee80211_amrr.c b/sys/net80211/ieee80211_amrr.c
--- a/sys/net80211/ieee80211_amrr.c
+++ b/sys/net80211/ieee80211_amrr.c
@@ -138,25 +138,6 @@
 	nrefs--;		/* XXX locking */
 }
 
-/*
- * Return whether 11n rates are possible.
- *
- * Some 11n devices may return HT information but no HT rates.
- * Thus, we shouldn't treat them as an 11n node.
- */
-static int
-amrr_node_is_11n(struct ieee80211_node *ni)
-{
-
-	if (ni->ni_chan == NULL)
-		return (0);
-	if (ni->ni_chan == IEEE80211_CHAN_ANYC)
-		return (0);
-	if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && ni->ni_htrates.rs_nrates == 0)
-		return (0);
-	return (IEEE80211_IS_CHAN_HT(ni->ni_chan));
-}
-
 static void
 amrr_node_init(struct ieee80211_node *ni)
 {
@@ -189,7 +170,7 @@
 	amn->amn_success_threshold = amrr->amrr_min_success_threshold;
 
 	/* 11n or not? Pick the right rateset */
-	if (amrr_node_is_11n(ni)) {
+	if (ieee80211_ht_check_tx_ht(ni)) {
 		/* XXX ew */
 		IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
 		    "%s: 11n node", __func__);
@@ -204,7 +185,7 @@
 	rate = rs->rs_rates[0];
 
 	/* XXX clear the basic rate flag if it's not 11n */
-	if (! amrr_node_is_11n(ni))
+	if (! ieee80211_ht_check_tx_ht(ni))
 		rate &= IEEE80211_RATE_VAL;
 
 	/* pick initial rate from the rateset - HT or otherwise */
@@ -213,7 +194,7 @@
 	    amn->amn_rix--) {
 		/* legacy - anything < 36mbit, stop searching */
 		/* 11n - stop at MCS4 */
-		if (amrr_node_is_11n(ni)) {
+		if (ieee80211_ht_check_tx_ht(ni)) {
 			if ((rs->rs_rates[amn->amn_rix] & 0x1f) < 4)
 				break;
 		} else if ((rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL) <= 72)
@@ -222,7 +203,7 @@
 	rate = rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL;
 
 	/* if the rate is an 11n rate, ensure the MCS bit is set */
-	if (amrr_node_is_11n(ni))
+	if (ieee80211_ht_check_tx_ht(ni))
 		rate |= IEEE80211_RATE_MCS;
 
 	/* Assign initial rate from the rateset */
@@ -234,7 +215,7 @@
 	IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
 	    "AMRR: nrates=%d, initial rate %s%d",
 	    rs->rs_nrates,
-	    amrr_node_is_11n(ni) ? "MCS " : "",
+	    ieee80211_ht_check_tx_ht(ni) ? "MCS " : "",
 	    rate & IEEE80211_RATE_VAL);
 }
 
@@ -254,7 +235,7 @@
 	KASSERT(is_enough(amn), ("txcnt %d", amn->amn_txcnt));
 
 	/* 11n or not? Pick the right rateset */
-	if (amrr_node_is_11n(ni)) {
+	if (ieee80211_ht_check_tx_ht(ni)) {
 		/* XXX ew */
 		rs = (struct ieee80211_rateset *) &ni->ni_htrates;
 	} else {
@@ -347,7 +328,7 @@
 	amrr = amn->amn_amrr;
 
 	/* 11n or not? Pick the right rateset */
-	if (amrr_node_is_11n(ni)) {
+	if (ieee80211_ht_check_tx_ht(ni)) {
 		/* XXX ew */
 		rs = (struct ieee80211_rateset *) &ni->ni_htrates;
 	} else {
@@ -360,7 +341,7 @@
 			/* update public rate */
 			ni->ni_txrate = rs->rs_rates[rix];
 			/* XXX strip basic rate flag from txrate, if non-11n */
-			if (amrr_node_is_11n(ni))
+			if (ieee80211_ht_check_tx_ht(ni))
 				ni->ni_txrate |= IEEE80211_RATE_MCS;
 			else
 				ni->ni_txrate &= IEEE80211_RATE_VAL;
@@ -482,7 +463,7 @@
 	int rate;
 	struct ieee80211_rateset *rs;
 
-	if (amrr_node_is_11n(ni)) {
+	if (ieee80211_ht_check_tx_ht(ni)) {
 		rs = (struct ieee80211_rateset *) &ni->ni_htrates;
 		rate = rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL;
 		sbuf_printf(s, "rate: MCS %d\n", rate);