diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 5fae8ca..685cc15 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3586,7 +3586,7 @@
 	const struct regulation_constraints *constraints = NULL;
 	const struct regulator_init_data *init_data;
 	struct regulator_config *config = NULL;
-	static atomic_t regulator_no = ATOMIC_INIT(0);
+	static atomic_t regulator_no = ATOMIC_INIT(-1);
 	struct regulator_dev *rdev;
 	struct device *dev;
 	int ret, i;
@@ -3669,8 +3669,8 @@
 	/* register with sysfs */
 	rdev->dev.class = &regulator_class;
 	rdev->dev.parent = dev;
-	dev_set_name(&rdev->dev, "regulator.%d",
-		     atomic_inc_return(&regulator_no) - 1);
+	dev_set_name(&rdev->dev, "regulator.%lu",
+		    (unsigned long) atomic_inc_return(&regulator_no));
 	ret = device_register(&rdev->dev);
 	if (ret != 0) {
 		put_device(&rdev->dev);