diff --git a/data/require_base.php b/data/require_base.php
index 4c7513583d..3891955f7b 100644
--- a/data/require_base.php
+++ b/data/require_base.php
@@ -21,6 +21,8 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  */
 
+ ob_start();
+
 if (!defined('DATA_REALDIR')) {
     define('DATA_REALDIR', HTML_REALDIR . HTML2DATA_DIR);
 }
diff --git a/html/admin/require.php b/html/admin/require.php
index a9cd76b818..0d61d15baf 100644
--- a/html/admin/require.php
+++ b/html/admin/require.php
@@ -29,4 +29,3 @@
 
 require_once HTML_REALDIR . 'define.php';
 require_once HTML_REALDIR . HTML2DATA_DIR . 'require_base.php';
-ob_start();
diff --git a/html/install/index.php b/html/install/index.php
index fb11b432ad..609034fd53 100644
--- a/html/install/index.php
+++ b/html/install/index.php
@@ -41,7 +41,6 @@
 defined('ADMIN_DIR') or define('ADMIN_DIR', '');
 
 require_once HTML_REALDIR . HTML2DATA_DIR . 'require_base.php';
-ob_start();
 // ▲require.php 相当
 
 $ownDir = realpath(dirname(__FILE__)) . '/';