diff --git a/ext/mini_racer_loader/mini_racer_loader.c b/ext/mini_racer_loader/mini_racer_loader.c
index 0516275d..cb9aa3f5 100644
--- a/ext/mini_racer_loader/mini_racer_loader.c
+++ b/ext/mini_racer_loader/mini_racer_loader.c
@@ -115,7 +115,7 @@ static void *_dln_load(const char *file)
     rb_raise(rb_eLoadError, "%s", error);
 }
 
-__attribute__((visibility("default"))) void Init_mini_racer_loader()
+__attribute__((visibility("default"))) void Init_mini_racer_loader(void)
 {
     VALUE mMiniRacer = rb_define_module("MiniRacer");
     VALUE mLoader = rb_define_module_under(mMiniRacer, "Loader");