diff --git a/htdocs/core/class/html.formadmin.class.php b/htdocs/core/class/html.formadmin.class.php
index 042474781d7..30ecadedb55 100644
--- a/htdocs/core/class/html.formadmin.class.php
+++ b/htdocs/core/class/html.formadmin.class.php
@@ -53,9 +53,10 @@ class FormAdmin
 	 * 		@param		array		$filter			Array of keys to exclude in list
 	 * 		@param		int			$showempty		Add empty value
 	 *      @param      int			$showwarning    Show a warning if language is not complete
+	 *      @param		int			$disabled		Disable edit of select
 	 *      @return		string						Return HTML select string with list of languages
 	 */
-	function select_language($selected='',$htmlname='lang_id',$showauto=0,$filter=0,$showempty=0,$showwarning=0)
+	function select_language($selected='',$htmlname='lang_id',$showauto=0,$filter=0,$showempty=0,$showwarning=0,$disabled=0)
 	{
 		global $langs;
 
@@ -63,7 +64,7 @@ class FormAdmin
 
 		$out='';
 
-		$out.= '<select class="flat" id="'.$htmlname.'" name="'.$htmlname.'">';
+		$out.= '<select class="flat" id="'.$htmlname.'" name="'.$htmlname.'"'.($disabled?' disabled="disabled"':'').'>';
 		if ($showempty)
 		{
 			$out.= '<option value=""';
diff --git a/htdocs/user/param_ihm.php b/htdocs/user/param_ihm.php
index 65e9e4ca7a6..7459d467633 100644
--- a/htdocs/user/param_ihm.php
+++ b/htdocs/user/param_ihm.php
@@ -179,10 +179,10 @@ if ($action == 'edit')
     print ($conf->global->MAIN_LANG_DEFAULT=='auto'?$langs->trans("AutoDetectLang"):$langs->trans("Language_".$conf->global->MAIN_LANG_DEFAULT));
     print '</td>';
     print '<td align="left" class="nowrap" width="20%"><input '.$bc[$var].' name="check_MAIN_LANG_DEFAULT" id="check_MAIN_LANG_DEFAULT" type="checkbox" '.(! empty($fuser->conf->MAIN_LANG_DEFAULT)?" checked":"");
-    print ! empty($dolibarr_main_demo)?' disabled="disabled"':'';	// Disabled for demo
+    print empty($dolibarr_main_demo)?'':' disabled="disabled"';	// Disabled for demo
     print '> '.$langs->trans("UsePersonalValue").'</td>';
     print '<td>';
-    print $formadmin->select_language((! empty($fuser->conf->MAIN_LANG_DEFAULT)?$fuser->conf->MAIN_LANG_DEFAULT:''),'main_lang_default',1);
+    print $formadmin->select_language((! empty($fuser->conf->MAIN_LANG_DEFAULT)?$fuser->conf->MAIN_LANG_DEFAULT:''),'main_lang_default',1,null,0,0,(! empty($dolibarr_main_demo)));
     print '</td></tr>';
 
     // Taille max des listes
@@ -190,7 +190,7 @@ if ($action == 'edit')
     print '<tr '.$bc[$var].'><td>'.$langs->trans("MaxSizeList").'</td>';
     print '<td>'.$conf->global->MAIN_SIZE_LISTE_LIMIT.'</td>';
     print '<td align="left" class="nowrap" width="20%"><input '.$bc[$var].' name="check_SIZE_LISTE_LIMIT" id="check_SIZE_LISTE_LIMIT" type="checkbox" '.(! empty($fuser->conf->MAIN_SIZE_LISTE_LIMIT)?" checked":"");
-    print ! empty($dolibarr_main_demo)?' disabled="disabled"':'';	// Disabled for demo
+    print empty($dolibarr_main_demo)?'':' disabled="disabled"';	// Disabled for demo
     print '> '.$langs->trans("UsePersonalValue").'</td>';
     print '<td><input class="flat" name="main_size_liste_limit" id="main_size_liste_limit" size="4" value="' . (! empty($fuser->conf->MAIN_SIZE_LISTE_LIMIT)?$fuser->conf->MAIN_SIZE_LISTE_LIMIT:'') . '"></td></tr>';