diff --git a/firmware/target/arm/as3525/sansa-clipzip/backlight-target.h b/firmware/target/arm/as3525/sansa-clipzip/backlight-target.h
index da106e4e8f..bf58973ab6 100644
--- a/firmware/target/arm/as3525/sansa-clipzip/backlight-target.h
+++ b/firmware/target/arm/as3525/sansa-clipzip/backlight-target.h
@@ -24,6 +24,7 @@
 bool _backlight_init(void);
 void _backlight_on(void);
 void _backlight_off(void);
+void _backlight_set_brightness(int brightness);
 
 #define _backlight_panic_on() _backlight_on()