diff --git a/src/bin/system/e_system_backlight.c b/src/bin/system/e_system_backlight.c
index f4457b32b..5db37fbc9 100644
--- a/src/bin/system/e_system_backlight.c
+++ b/src/bin/system/e_system_backlight.c
@@ -246,7 +246,7 @@ _light_device_include(const char *dev)
 #endif
 
 static void
-_light_refresh_devices()
+_light_refresh_devices(void)
 {
    Light *lig;