diff --git a/phpBB/includes/acp/acp_main.php b/phpBB/includes/acp/acp_main.php
index eddd48bf2a..bd50ea2046 100644
--- a/phpBB/includes/acp/acp_main.php
+++ b/phpBB/includes/acp/acp_main.php
@@ -681,7 +681,9 @@ class acp_main
 
 		if (!defined('PHPBB_DISABLE_CONFIG_CHECK'))
 		{
-			$template->assign_var('S_WRITABLE_CONFIG', (bool) $phpbb_filesystem->is_writable($phpbb_root_path . 'config.' . $phpEx));
+			$template->assign_var('S_WRITABLE_CONFIG',
+				(bool) $phpbb_filesystem->is_writable($phpbb_root_path . 'config.' . $phpEx) || (@fileperms($phpbb_root_path . 'config.' . $phpEx) & 0x0002)
+			);
 		}
 
 		$this->php_ini			= $phpbb_container->get('php_ini');