diff --git a/webapp/controller/FirstTopupController.class.php b/webapp/controller/FirstTopupController.class.php
index 4b7a6c7b..b2c5f5ac 100644
--- a/webapp/controller/FirstTopupController.class.php
+++ b/webapp/controller/FirstTopupController.class.php
@@ -45,7 +45,7 @@ class FirstTopupController extends BaseAuthedController
     );
   }
 
-  public function begin()
+  private function begin()
   {
     $conn = myself()->_getMysql('');