diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 0640745c051..028e3f6c5a8 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -732,7 +732,7 @@ function top_htmlhead($head, $title='', $disablejs=0, $disablehead=0, $arrayofjs
 		print '<link rel="alternate stylesheet" type="text/css" title="Yellow" href="'.DOL_URL_ROOT.'/theme/yellow/yellow.css">'."\n";
 		*/
 
-		if (empty($conf->global->MAIN_OPTIMIZEFORTEXTBROWSER)) print '<link rel="top" title="'.$langs->trans("Home").'" href="'.DOL_URL_ROOT.'">'."\n";
+		if (empty($conf->global->MAIN_OPTIMIZEFORTEXTBROWSER)) print '<link rel="top" title="'.$langs->trans("Home").'" href="'.(DOL_URL_ROOT?DOL_URL_ROOT:'/').'">'."\n";
 		if (empty($conf->global->MAIN_OPTIMIZEFORTEXTBROWSER)) print '<link rel="copyright" title="GNU General Public License" href="http://www.gnu.org/copyleft/gpl.html#SEC1">'."\n";
 		if (empty($conf->global->MAIN_OPTIMIZEFORTEXTBROWSER)) print '<link rel="author" title="Dolibarr Development Team" href="http://www.dolibarr.org">'."\n";