diff --git a/ext_localconf.php b/ext_localconf.php
index 10a8175..04e145d 100644
--- a/ext_localconf.php
+++ b/ext_localconf.php
@@ -2,16 +2,14 @@
 
 declare(strict_types=1);
 
-defined('TYPO3') or die();
-
 use B13\Container\Backend\Grid\ContainerGridColumn as BaseContainerGridColumn;
 use Evoweb\EwCollapsibleContainer\Xclass\ContainerGridColumn;
 use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
 
-call_user_func(function () {
-    if (ExtensionManagementUtility::isLoaded('container')) {
-        $GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][BaseContainerGridColumn::class] = [
-            'className' => ContainerGridColumn::class,
-        ];
-    }
-});
+defined('TYPO3') or die();
+
+if (ExtensionManagementUtility::isLoaded('container')) {
+    $GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][BaseContainerGridColumn::class] = [
+        'className' => ContainerGridColumn::class,
+    ];
+}