diff --git a/lib/Service/LangRepository.php b/lib/Service/LangRepository.php
index c998a7e..3c379f0 100644
--- a/lib/Service/LangRepository.php
+++ b/lib/Service/LangRepository.php
@@ -26,7 +26,12 @@ class LangRepository
         $qb = $this->db->getQueryBuilder();
 
         $qb->select($qb->createFunction('DISTINCT configvalue'))
-            ->where('configkey="lang" and appid="core" and configvalue<>"en"')
+            ->where('configkey=:configkey and appid=:appid and configvalue<>:configvalue')
+            ->setParameters([
+                'configkey' => 'lang',
+                'appid' => 'core',
+                'configvalue' => 'en',
+            ])
             ->from('preferences')
         ;