diff --git a/htdocs/mrp/mo_agenda.php b/htdocs/mrp/mo_agenda.php
index b642ef7ada9..4619b04f7a1 100644
--- a/htdocs/mrp/mo_agenda.php
+++ b/htdocs/mrp/mo_agenda.php
@@ -131,7 +131,7 @@ $formproject = new FormProjets($db);
 if ($object->id > 0) {
 	$title = $langs->trans("Agenda");
 	//if (! empty($conf->global->MAIN_HTML_TITLE) && preg_match('/thirdpartynameonly/',$conf->global->MAIN_HTML_TITLE) && $object->name) $title=$object->name." - ".$title;
-	$help_url = 'Module_Agenda_En';
+	$help_url = 'EN:Module_Agenda_En';
 	llxHeader('', $title, $help_url);
 
 	if (!empty($conf->notification->enabled)) {