diff --git a/phpBB/phpbb/db/migration/data/v400/rename_duplicated_index_names.php b/phpBB/phpbb/db/migration/data/v400/rename_duplicated_index_names.php
index eb785878fb..b4c10271e6 100644
--- a/phpBB/phpbb/db/migration/data/v400/rename_duplicated_index_names.php
+++ b/phpBB/phpbb/db/migration/data/v400/rename_duplicated_index_names.php
@@ -13,10 +13,10 @@
 
 namespace phpbb\db\migration\data\v400;
 
-use phpbb\db\migration\container_aware_migration;
+use phpbb\db\migration\migration;
 use phpbb\db\doctrine\table_helper;
 
-class rename_duplicated_index_names extends container_aware_migration
+class rename_duplicated_index_names extends migration
 {
 	public static function depends_on()
 	{
@@ -90,8 +90,7 @@ class rename_duplicated_index_names extends container_aware_migration
 	public function get_tables_index_names()
 	{
 		$table_keys = [];
-		$doctrine = $this->container->get('dbal.conn.doctrine');
-		$schema_manager = $doctrine->createSchemaManager();
+		$schema_manager = $this->db_doctrine->createSchemaManager();
 		$table_names = $schema_manager->listTableNames();
 
 		if (!empty($table_names))
diff --git a/phpBB/phpbb/db/migration/migration.php b/phpBB/phpbb/db/migration/migration.php
index 6bfc395e4d..63290229f9 100644
--- a/phpBB/phpbb/db/migration/migration.php
+++ b/phpBB/phpbb/db/migration/migration.php
@@ -28,6 +28,9 @@ abstract class migration implements migration_interface
 	/** @var \phpbb\db\driver\driver_interface */
 	protected $db;
 
+	/** @var \Doctrine\DBAL\Connection */
+	protected $db_doctrine;
+
 	/** @var \phpbb\db\tools\tools_interface */
 	protected $db_tools;
 
@@ -72,6 +75,9 @@ abstract class migration implements migration_interface
 		$this->php_ext = $php_ext;
 
 		$this->errors = array();
+
+		$phpbb_config_php_file = new \phpbb\config_php_file($phpbb_root_path, $php_ext);
+		$this->db_doctrine = \phpbb\db\doctrine\connection_factory::get_connection($phpbb_config_php_file);
 	}
 
 	/**