diff --git a/external/import.php b/external/import.php
index 8690d623c..674f614e5 100644
--- a/external/import.php
+++ b/external/import.php
@@ -3,9 +3,7 @@
 use XHGui\Saver\SaverInterface;
 use XHGui\ServiceContainer;
 
-if (!defined('XHGUI_ROOT_DIR')) {
-    require dirname(__DIR__) . '/src/bootstrap.php';
-}
+require __DIR__ . '/../vendor/autoload.php';
 
 $options = getopt('f:');
 
diff --git a/src/ServiceProvider/ConfigProvider.php b/src/ServiceProvider/ConfigProvider.php
index d0afd7125..76f67d744 100644
--- a/src/ServiceProvider/ConfigProvider.php
+++ b/src/ServiceProvider/ConfigProvider.php
@@ -11,6 +11,12 @@ class ConfigProvider implements ServiceProviderInterface
     public function register(Container $app)
     {
         $app['config'] = static function ($app) {
+            // @deprecated
+            // define XHGUI_ROOT_DIR constant, config files may use it
+            if (!defined('XHGUI_ROOT_DIR')) {
+                define('XHGUI_ROOT_DIR', $app['app.dir']);
+            }
+
             Config::load($app['app.config_dir'] . '/config.default.php');
 
             if (file_exists($app['app.config_dir'] . '/config.php')) {
diff --git a/src/bootstrap.php b/src/bootstrap.php
deleted file mode 100644
index a3a8fa2db..000000000
--- a/src/bootstrap.php
+++ /dev/null
@@ -1,12 +0,0 @@
-<?php
-/**
- * Boostrapping and common utility definition.
- */
-
-define('XHGUI_ROOT_DIR', dirname(__DIR__));
-
-if (file_exists(XHGUI_ROOT_DIR . '/vendor/autoload.php')) {
-    require XHGUI_ROOT_DIR . '/vendor/autoload.php';
-} elseif (file_exists(XHGUI_ROOT_DIR . '/../../autoload.php')) {
-    require XHGUI_ROOT_DIR . '/../../autoload.php';
-}
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index e11dad129..9d7dc2399 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -5,7 +5,7 @@
 
 use XHGui\ServiceContainer;
 
-require dirname(__DIR__) . '/src/bootstrap.php';
+require __DIR__ . '/../vendor/autoload.php';
 
 $di = ServiceContainer::instance();
 
diff --git a/webroot/index.php b/webroot/index.php
index 3a280e67c..fc4c831c5 100644
--- a/webroot/index.php
+++ b/webroot/index.php
@@ -2,7 +2,7 @@
 
 use XHGui\ServiceContainer;
 
-require dirname(__DIR__) . '/src/bootstrap.php';
+require dirname(__DIR__) . '/vendor/autoload.php';
 
 $di = new ServiceContainer();
 $app = $di['app'];