diff --git a/htdocs/admin/ihm.php b/htdocs/admin/ihm.php
index 27c86bbae0d..4e282f6c6d8 100644
--- a/htdocs/admin/ihm.php
+++ b/htdocs/admin/ihm.php
@@ -126,13 +126,13 @@ if (isset($_GET["action"]) && $_GET["action"] == 'edit')
     // Désactiver javascript
     $var=!$var;
     print '<tr '.$bc[$var].'"><td width="35%">'.$langs->trans("DisableJavascript").'</td><td>';
-    $html->selectyesnonum('disable_javascript',$conf->global->MAIN_DISABLE_JAVASCRIPT);
+    $html->selectyesnonum('disable_javascript',isset($conf->global->MAIN_DISABLE_JAVASCRIPT)?$conf->global->MAIN_DISABLE_JAVASCRIPT:0);
     print '</td></tr>';
     
     // Désactiver ajax
     $var=!$var;
     print '<tr '.$bc[$var].'"><td width="35%">'.$langs->trans("DisableAjax").'</td><td>';
-    $html->selectyesnonum('disable_ajax',$conf->global->MAIN_DISABLE_AJAX);
+    $html->selectyesnonum('disable_ajax',isset($conf->global->MAIN_DISABLE_AJAX)?$conf->global->MAIN_DISABLE_AJAX:1);
     print '</td></tr>';
     
     // Désactiver le calendrier popup
diff --git a/htdocs/master.inc.php b/htdocs/master.inc.php
index b10e8895f81..91b10d95b15 100644
--- a/htdocs/master.inc.php
+++ b/htdocs/master.inc.php
@@ -363,7 +363,7 @@ $conf->use_javascript=1;
 if (isset($conf->global->MAIN_DISABLE_JAVASCRIPT)) $conf->use_javascript=! $conf->global->MAIN_DISABLE_JAVASCRIPT;
 
 // conf->use_ajax
-$conf->use_ajax=""; // Pas d' Ajax par defaut
+$conf->use_ajax=0; // Pas d' Ajax par defaut
 if (isset($conf->global->MAIN_DISABLE_AJAX)) $conf->use_ajax=! $conf->global->MAIN_DISABLE_AJAX;
 
 // conf->use_popup_calendar