diff --git a/drivers/hwmon/w83791d.c b/drivers/hwmon/w83791d.c
index cb3765fec98c079e121472830bd576e37e17fab9..001df856913feba93790bf9383b2023115defad3 100644
--- a/drivers/hwmon/w83791d.c
+++ b/drivers/hwmon/w83791d.c
@@ -1181,6 +1181,9 @@ static ssize_t store_vrm_reg(struct device *dev,
 	if (err)
 		return err;
 
+	if (val > 255)
+		return -EINVAL;
+
 	data->vrm = val;
 	return count;
 }