diff --git a/drivers/acpi/ac.c b/drivers/acpi/ac.c
index 36b0e61..8bf5168 100644
--- a/drivers/acpi/ac.c
+++ b/drivers/acpi/ac.c
@@ -351,7 +351,7 @@
 	ac->charger.properties = ac_props;
 	ac->charger.num_properties = ARRAY_SIZE(ac_props);
 	ac->charger.get_property = get_ac_property;
-	result = power_supply_register(&ac->device->dev, &ac->charger);
+	result = power_supply_register(&ac->device->dev, &ac->charger, NULL);
 	if (result)
 		goto end;