diff --git a/Configuration/TCA/Overrides/tt_content.php b/Configuration/TCA/Overrides/tt_content.php
index 5bb389a..de606bb 100644
--- a/Configuration/TCA/Overrides/tt_content.php
+++ b/Configuration/TCA/Overrides/tt_content.php
@@ -1,9 +1,7 @@
 <?php
 
-use TYPO3\CMS\Extbase\Utility\ExtensionUtility;
-
-call_user_func(function ($extension, $table) {
-    ExtensionUtility::registerPlugin(
+(function ($extension, $table) {
+    \TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerPlugin(
         'Codappix.' . $extension,
         'Search',
         'LLL:EXT:search_core/Resources/Private/Language/locallang_be.xlf:plugin.search.title',
@@ -11,4 +9,4 @@ call_user_func(function ($extension, $table) {
     );
 
     $GLOBALS['TCA'][$table]['types']['list']['subtypes_excludelist']['searchcore_search'] = 'recursive,pages';
-}, 'search_core', 'tt_content');
+})('search_core', 'tt_content');
diff --git a/ext_localconf.php b/ext_localconf.php
index 419495e..0941be3 100644
--- a/ext_localconf.php
+++ b/ext_localconf.php
@@ -1,6 +1,6 @@
 <?php
 
-call_user_func(function ($extension, $configuration) {
+(function ($extension, $configuration) {
     if (is_string($configuration)) {
         $configuration = unserialize($GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf'][$extension]);
     }
@@ -68,4 +68,4 @@ call_user_func(function ($extension, $configuration) {
             \Codappix\SearchCore\Domain\Search\CachedSearchService::class
         );
     }
-}, $_EXTKEY, $_EXTCONF);
+})($_EXTKEY, $_EXTCONF);