diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.c b/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.c
index ddf74d5270179bf77412bc0c9c742e6df2001318..0c3b9ce86e2e516152c6feabbac68d41ad162af9 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.c
@@ -959,7 +959,7 @@ static void _rtl8821ae_phy_store_txpower_by_rate_base(struct ieee80211_hw *hw)
 static void _phy_convert_txpower_dbm_to_relative_value(u32 *data, u8 start,
 						u8 end, u8 base_val)
 {
-	char i = 0;
+	int i;
 	u8 temp_value = 0;
 	u32 temp_data = 0;