diff --git a/bootstrap/index.php b/bootstrap/index.php
index 8fe0806..e5527b3 100644
--- a/bootstrap/index.php
+++ b/bootstrap/index.php
@@ -3,7 +3,7 @@
 /**
  * register constants
  */
-require_once __DIR__ . '/constants.php';
+require_once __DIR__ . '/constant.php';
 
 /**
  * load useful functions