diff --git a/drivers/net/wireless/rtl8180_grf5101.c b/drivers/net/wireless/rtl8180_grf5101.c
index 8293e19..5d47935 100644
--- a/drivers/net/wireless/rtl8180_grf5101.c
+++ b/drivers/net/wireless/rtl8180_grf5101.c
@@ -73,8 +73,9 @@
 				   struct ieee80211_conf *conf)
 {
 	struct rtl8180_priv *priv = dev->priv;
-	u32 txpw = priv->channels[conf->channel - 1].val & 0xFF;
-	u32 chan = conf->channel - 1;
+	int channel = ieee80211_frequency_to_channel(conf->channel->center_freq);
+	u32 txpw = priv->channels[channel - 1].hw_value & 0xFF;
+	u32 chan = channel - 1;
 
 	/* set TX power */
 	write_grf5101(dev, 0x15, 0x0);