diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 51882f7386cc..716afea0db24 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -1400,6 +1400,9 @@ static ssize_t set_fan(struct device *dev, struct device_attribute *attr,
 	if (kstrtol(buf, 10, &val) < 0)
 		return -EINVAL;
 
+	if (val < 0)
+		val = 0;
+
 	err = it87_lock(data);
 	if (err)
 		return err;