diff --git a/mt7925/mcu.c b/mt7925/mcu.c
index 723848bc..e1875a2f 100644
--- a/mt7925/mcu.c
+++ b/mt7925/mcu.c
@@ -3678,7 +3678,7 @@ mt7925_mcu_rate_txpower_band(struct mt76_phy *phy,
 		memcpy(tx_power_tlv->alpha2, dev->alpha2, sizeof(dev->alpha2));
 		tx_power_tlv->n_chan = num_ch;
 		tx_power_tlv->tag = cpu_to_le16(0x1);
-		tx_power_tlv->len = cpu_to_le16(sizeof(*tx_power_tlv));
+		tx_power_tlv->len = cpu_to_le16(msg_len);
 
 		switch (band) {
 		case NL80211_BAND_2GHZ: