diff --git a/src/clevo_leds.h b/src/clevo_leds.h
index ebd29af..5714756 100644
--- a/src/clevo_leds.h
+++ b/src/clevo_leds.h
@@ -376,7 +376,7 @@ int clevo_leds_remove(struct platform_device *dev) {
 }
 EXPORT_SYMBOL(clevo_leds_remove);
 
-enum clevo_kb_backlight_types clevo_leds_get_backlight_type() {
+enum clevo_kb_backlight_types clevo_leds_get_backlight_type(void) {
 	return clevo_kb_backlight_type;
 }
 EXPORT_SYMBOL(clevo_leds_get_backlight_type);
diff --git a/src/uniwill_leds.h b/src/uniwill_leds.h
index 63639fa..2145252 100644
--- a/src/uniwill_leds.h
+++ b/src/uniwill_leds.h
@@ -275,7 +275,7 @@ int uniwill_leds_remove(struct platform_device *dev)
 }
 EXPORT_SYMBOL(uniwill_leds_remove);
 
-enum uniwill_kb_backlight_types uniwill_leds_get_backlight_type() {
+enum uniwill_kb_backlight_types uniwill_leds_get_backlight_type(void) {
 	return uniwill_kb_backlight_type;
 }
 EXPORT_SYMBOL(uniwill_leds_get_backlight_type);