diff --git a/models/DataObject/ClassDefinition/Helper/Dao.php b/models/DataObject/ClassDefinition/Helper/Dao.php
index b7fb30b37c9..a3489e67201 100644
--- a/models/DataObject/ClassDefinition/Helper/Dao.php
+++ b/models/DataObject/ClassDefinition/Helper/Dao.php
@@ -15,8 +15,6 @@
 
 namespace Pimcore\Model\DataObject\ClassDefinition\Helper;
 
-use Doctrine\DBAL\Exception\UniqueConstraintViolationException;
-use Pimcore\Db\Helper;
 use Pimcore\Model\DataObject;
 
 /**