diff --git a/Classes/Domain/Renderer/Command.php b/Classes/Domain/Renderer/Command.php
index e4480e7..87a8613 100644
--- a/Classes/Domain/Renderer/Command.php
+++ b/Classes/Domain/Renderer/Command.php
@@ -1,6 +1,7 @@
 <?php
 namespace Saccas\Mjml\Domain\Renderer;
 
+use TYPO3\CMS\Core\Configuration\ExtensionConfiguration;
 use TYPO3\CMS\Core\Utility\CommandUtility;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
@@ -9,7 +10,7 @@ class Command implements RendererInterface
 {
     public function getHtmlFromMjml($mjml): string
     {
-        $conf = unserialize($GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf']['mjml']);
+        $conf = GeneralUtility::makeInstance(ExtensionConfiguration::class)->get('mjml');
 
         $temporaryMjmlFileWithPath = GeneralUtility::tempnam('mjml_', '.mjml');