diff --git a/tests/test_framework/phpbb_session_test_case.php b/tests/test_framework/phpbb_session_test_case.php
index 36b4ff025f..0a2f767845 100644
--- a/tests/test_framework/phpbb_session_test_case.php
+++ b/tests/test_framework/phpbb_session_test_case.php
@@ -20,13 +20,14 @@ abstract class phpbb_session_test_case extends phpbb_database_test_case
 	{
 		parent::setUp();
 
-		global $symfony_request, $phpbb_path_helper, $request, $phpbb_root_path, $phpEx;
+		global $symfony_request, $phpbb_filesystem, $phpbb_path_helper, $request, $phpbb_root_path, $phpEx;
 		$symfony_request = new \phpbb\symfony_request(
 			new phpbb_mock_request()
 		);
+		$phpbb_filesystem = new \phpbb\filesystem();
 		$phpbb_path_helper = new \phpbb\path_helper(
 			$symfony_request,
-			new \phpbb\filesystem(),
+			$phpbb_filesystem,
 			$phpbb_root_path,
 			$phpEx
 		);