diff --git a/ChangeLog b/ChangeLog
index 11d13f25a..d89e5eca8 100755
--- a/ChangeLog
+++ b/ChangeLog
@@ -5,6 +5,9 @@ phpMyAdmin - Changelog
 $Id$
 $Source$
 
+2006-01-19 Marc Delisle  <lem9@users.sourceforge.net>
+    * main.php: already defined constant
+
 2006-01-19 Sebastian Mendel <cybot_tm@users.sourceforge.net>
     * pdf_schema.php, db_details_qbe.php, libraries\display_tbl.lib.php,
       libraries\export\htmlword.php, libraries\export\latex.php,
diff --git a/main.php b/main.php
index b94caa51f..554104b66 100644
--- a/main.php
+++ b/main.php
@@ -5,7 +5,9 @@
 /**
  * Don't display the page heading
  */
-define('PMA_DISPLAY_HEADING', 0);
+if (!defined('PMA_DISPLAY_HEADING')) {
+    define('PMA_DISPLAY_HEADING', 0);
+}
 
 /**
  * Gets some core libraries and displays a top message if required