diff --git a/index.php b/index.php
index d398fb5..93e26fe 100644
--- a/index.php
+++ b/index.php
@@ -43,6 +43,7 @@ function load() {
     require_once __DIR__ . '/plugin/index.php';
     require_once __DIR__ . '/preact/index.php';
     require_once __DIR__ . '/select/index.php';
+    require_once __DIR__ . '/async-action/index.php';
 
     do_action($this->name . '_ready');
   }