diff --git a/public/main/admin/update_schema.php b/public/main/admin/update_schema.php
index e27abf35d1..6c2a6f1680 100644
--- a/public/main/admin/update_schema.php
+++ b/public/main/admin/update_schema.php
@@ -17,11 +17,11 @@ $connection = Database::getManager()->getConnection();
 $sm = $connection->createSchemaManager();
 $fromSchema = $sm->createSchema();
 
-$tool = new \Doctrine\ORM\Tools\SchemaTool(Database::getManager());
+$tool = new \Doctrine\ORM\Tools\SchemaTool($em);
 $metadatas = $em->getMetadataFactory()->getAllMetadata();
 $toSchema = $tool->getSchemaFromMetadata($metadatas);
-$comparator = new \Doctrine\DBAL\Schema\Comparator();
-$schemaDiff = $comparator->compareSchemas($fromSchema, $toSchema);
+
+$schemaDiff = $sm->createComparator()->compareSchemas($fromSchema, $toSchema);
 
 $sqlList = $schemaDiff->toSaveSql($connection->getDatabasePlatform());
 $content = '';