diff --git a/Classes/Controller/ActionController.php b/Classes/Controller/ActionController.php
index 8c633c1..cc8dbab 100644
--- a/Classes/Controller/ActionController.php
+++ b/Classes/Controller/ActionController.php
@@ -354,9 +354,7 @@ class ActionController extends BaseController
     {
         return LocalizationUtility::translate(
             $key,
-            GeneralUtility::camelCaseToLowerCaseUnderscored(
-                $this->extensionName
-            ),
+            $this->getExtensionKey(),
             $arguments
         );
     }