diff --git a/drivers/hwmon/lm77.c b/drivers/hwmon/lm77.c
index dd969f1..46e3abad 100644
--- a/drivers/hwmon/lm77.c
+++ b/drivers/hwmon/lm77.c
@@ -138,7 +138,7 @@
 {										\
 	struct i2c_client *client = to_i2c_client(dev);				\
 	struct lm77_data *data = i2c_get_clientdata(client);			\
-	long val = simple_strtoul(buf, NULL, 10);				\
+	long val = simple_strtol(buf, NULL, 10);				\
 										\
 	mutex_lock(&data->update_lock);						\
 	data->value = val;				\