diff --git a/phpBB/install/app.php b/phpBB/install/app.php
index 36d16e914b..25386b5038 100644
--- a/phpBB/install/app.php
+++ b/phpBB/install/app.php
@@ -17,9 +17,7 @@
 define('IN_PHPBB', true);
 define('IN_INSTALL', true);
 if (!defined('PHPBB_ENVIRONMENT'))
-{
-	define('PHPBB_ENVIRONMENT', 'production');
-}
+
 $phpbb_root_path = '../';
 $phpEx = substr(strrchr(__FILE__, '.'), 1);