diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 75e91f5..a5cf1be 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -54,7 +54,7 @@
 };
 
 extern struct backlight_device *backlight_device_register(const char *name,
-	void *devdata, struct backlight_properties *bp);
+	struct device *dev,void *devdata,struct backlight_properties *bp);
 extern void backlight_device_unregister(struct backlight_device *bd);
 
 #define to_backlight_device(obj) container_of(obj, struct backlight_device, class_dev)