diff --git a/phpBB/install.php b/phpBB/install.php
index b3e619347e..a48c5ab8fd 100644
--- a/phpBB/install.php
+++ b/phpBB/install.php
@@ -25,7 +25,7 @@ set_magic_quotes_runtime(0); // Disable magic_quotes_runtime
 define('IN_PHPBB', true);
 $phpbb_root_path='./';
 include($phpbb_root_path.'extension.inc');
-include($phpbb_root_dir . 'includes/functions_selects.'.$phpEx);
+include($phpbb_root_path . 'includes/functions_selects.'.$phpEx);
 
 $userdata = array();
 $lang = array();