diff --git a/phpBB/includes/functions_container.php b/phpBB/includes/functions_container.php
index 36c5ad507e..106b7d75cc 100644
--- a/phpBB/includes/functions_container.php
+++ b/phpBB/includes/functions_container.php
@@ -57,7 +57,7 @@ function phpbb_create_install_container($phpbb_root_path, $php_ext)
 	$container = phpbb_create_container(array($core), $phpbb_root_path, $php_ext);
 
 	$container->setParameter('core.root_path', $phpbb_root_path);
-	$container->setParameter('core.adm_relative_path', 'adm/');
+	$container->setParameter('core.adm_relative_path', $phpbb_adm_relative_path);
 	$container->setParameter('core.php_ext', $php_ext);
 	$container->setParameter('core.table_prefix', '');