diff --git a/drivers/power/rx51_battery.c b/drivers/power/rx51_battery.c
index 03f57615be56..1bc5857b8bd5 100644
--- a/drivers/power/rx51_battery.c
+++ b/drivers/power/rx51_battery.c
@@ -51,7 +51,7 @@ static int rx51_battery_read_adc(int channel)
 	if (twl4030_madc_conversion(&req) <= 0)
 		return -ENODATA;
 
-	return req.rbuf[channel];
+	return req.rbuf[ffs(channel) - 1];
 }
 
 /*