diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 4bc5ea9721c22c643e9c641b016bc2aa8cbc1ae8..c2554d89d472f2d7ac470bfd5aacbdd7c55a3c57 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3659,7 +3659,7 @@ regulator_register(const struct regulator_desc *regulator_desc,
 	rdev->dev.class = &regulator_class;
 	rdev->dev.parent = dev;
 	dev_set_name(&rdev->dev, "regulator.%lu",
-		     atomic_inc_return(&regulator_no));
+		    (unsigned long) atomic_inc_return(&regulator_no));
 	ret = device_register(&rdev->dev);
 	if (ret != 0) {
 		put_device(&rdev->dev);