diff --git a/sys/dev/rtwn/rtl8812a/r12a_fw.c b/sys/dev/rtwn/rtl8812a/r12a_fw.c
--- a/sys/dev/rtwn/rtl8812a/r12a_fw.c
+++ b/sys/dev/rtwn/rtl8812a/r12a_fw.c
@@ -171,8 +171,9 @@
 	else
 		cmd.band_bw = RTWN_CMD_IQ_BAND_2GHZ;
 
-	/* TODO: 80/160 MHz. */
-	if (IEEE80211_IS_CHAN_HT40(c))
+	if (IEEE80211_IS_CHAN_VHT80(c))
+		cmd.band_bw |= RTWN_CMD_IQ_CHAN_WIDTH_80;
+	else if (IEEE80211_IS_CHAN_HT40(c))
 		cmd.band_bw |= RTWN_CMD_IQ_CHAN_WIDTH_40;
 	else
 		cmd.band_bw |= RTWN_CMD_IQ_CHAN_WIDTH_20;
diff --git a/sys/dev/rtwn/rtl8812a/r12a_reg.h b/sys/dev/rtwn/rtl8812a/r12a_reg.h
--- a/sys/dev/rtwn/rtl8812a/r12a_reg.h
+++ b/sys/dev/rtwn/rtl8812a/r12a_reg.h
@@ -75,8 +75,8 @@
 #define R12A_DATA_SEC_PRIM_DOWN_20	0x02
 #define R12A_DATA_SEC_PRIM_UPPER_20	0x03
 #define R12A_DATA_SEC_PRIM_LOWER_20	0x04
-#define R12A_DATA_SEC_PRIM_UP_40	0x90
-#define R12A_DATA_SEC_PRIM_DOWN_40	0xa0
+#define R12A_DATA_SEC_PRIM_UP_40	0x09
+#define R12A_DATA_SEC_PRIM_DOWN_40	0x0a
 
 /* Bits for R12A_HT_SINGLE_AMPDU. */
 #define R12A_HT_SINGLE_AMPDU_PKT_ENA	0x80
diff --git a/sys/dev/rtwn/rtl8812a/r12a_tx.c b/sys/dev/rtwn/rtl8812a/r12a_tx.c
--- a/sys/dev/rtwn/rtl8812a/r12a_tx.c
+++ b/sys/dev/rtwn/rtl8812a/r12a_tx.c
@@ -147,6 +147,9 @@
 		case IEEE80211_MODE_11NG:
 			mode = IEEE80211_MODE_11G;
 			break;
+		case IEEE80211_MODE_VHT_5GHZ:
+			mode = IEEE80211_MODE_VHT_5GHZ;
+			break;
 		default:
 			device_printf(sc->sc_dev, "unknown mode(1) %d!\n",
 			    ic->ic_curmode);
@@ -186,8 +189,14 @@
 				raid = R12A_RAID_11BGN_2;
 		}
 		break;
+		case IEEE80211_MODE_VHT_5GHZ:
+			if (sc->ntxchains == 1) {
+				raid = R12A_RAID_11AC_1;
+			} else {
+				raid = R12A_RAID_11AC_2;
+			}
+			break;
 	default:
-		/* TODO: 80 MHz / 11ac */
 		device_printf(sc->sc_dev, "unknown mode(2) %d!\n", mode);
 		return;
 	}
diff --git a/sys/dev/rtwn/rtl8812a/r12a_tx_desc.h b/sys/dev/rtwn/rtl8812a/r12a_tx_desc.h
--- a/sys/dev/rtwn/rtl8812a/r12a_tx_desc.h
+++ b/sys/dev/rtwn/rtl8812a/r12a_tx_desc.h
@@ -138,9 +138,7 @@
 #define R12A_RAID_11BG		6
 #define R12A_RAID_11G		7	/* "pure" 11g */
 #define R12A_RAID_11B		8
-#define R12A_RAID_11AC_2_80	9
-#define R12A_RAID_11AC_1_80	10
-#define R12A_RAID_11AC_1	11
-#define R12A_RAID_11AC_2	12
+#define R12A_RAID_11AC_2	9
+#define R12A_RAID_11AC_1	10
 
 #endif	/* R12A_TX_DESC_H */