diff --git a/src/Libs/Router.php b/src/Libs/Router.php
index 428ed6d..b56952d 100644
--- a/src/Libs/Router.php
+++ b/src/Libs/Router.php
@@ -50,7 +50,7 @@ class Router
      *
      * @var callable $notFoundCallback
      */
-    public static $notFoundCallback = Router::defaultNotFound(...);
+    public static $notFoundCallback =  'Libs\Router::defaultNotFound';
 
     /**
      * Default callback function for when
@@ -72,7 +72,7 @@ class Router
      *
      * @var callable $exceptionCallback
      */
-    public static $exceptionCallback = Router::defaultException(...);
+    public static $exceptionCallback = 'Libs\Router::defaultException';
 
     /**
      * Default callback function for exception responses.