diff --git a/Classes/Controller/SsoController.php b/Classes/Controller/SsoController.php
index 11b3802..5e26c31 100644
--- a/Classes/Controller/SsoController.php
+++ b/Classes/Controller/SsoController.php
@@ -35,13 +35,6 @@ use \TYPO3\CMS\Extensionmanager\Utility\ConfigurationUtility;
 class SsoController extends ActionController
 {
 
-    /**
-     * Configuration Utility (see definitions in ext_conf_template.txt).
-     *
-     * @var    \TYPO3\CMS\Extensionmanager\Utility\ConfigurationUtility $configurationUtility
-     * @inject
-     */
-    public $configurationUtility;
 
     /**
      * Compare if signed data matches given signature.
@@ -80,7 +73,8 @@ class SsoController extends ActionController
         $extKey = $_EXTKEY; //'dj_discourse_sso';
 
         /** @var \TYPO3\CMS\Extensionmanager\Utility\ConfigurationUtility $configurationUtility */
-        $extensionConfiguration = $this->configurationUtility->getCurrentConfiguration($extKey);
+        $configurationUtility   = $this->objectManager->get(ConfigurationUtility::class);
+        $extensionConfiguration = $configurationUtility->getCurrentConfiguration($extKey);
 
         GeneralUtility::devLog('authenticateAction', $extKey, 0, array('config' => $extensionConfiguration));
         // Check mandatory settings.