diff --git a/advancedcontentfilter/src/middlewares.php b/advancedcontentfilter/src/middlewares.php
index 35153a21..32e8cb99 100644
--- a/advancedcontentfilter/src/middlewares.php
+++ b/advancedcontentfilter/src/middlewares.php
@@ -1,4 +1,5 @@
 <?php
+use Friendica\Core\L10n;
 
 $container = $slim->getContainer();