diff --git a/install.php b/install.php
index 0ee261e7..15acf230 100644
--- a/install.php
+++ b/install.php
@@ -52,8 +52,6 @@ require_once 'Typecho/Router.php';
 /** 程序初始化 */
 Typecho_Common::init();
 
-ob_start();
-
 else:
 
     require_once dirname(__FILE__) . '/config.inc.php';
@@ -72,6 +70,8 @@ else:
 
 endif;
 
+ob_start();
+
 // 挡掉可能的跨站请求
 if (!empty($_GET) || !empty($_POST)) {
     if (empty($_SERVER['HTTP_REFERER'])) {