diff --git a/htdocs/comm/propal/list.php b/htdocs/comm/propal/list.php
index 74e783192af..0fbd9b060ca 100644
--- a/htdocs/comm/propal/list.php
+++ b/htdocs/comm/propal/list.php
@@ -33,6 +33,7 @@ require("../../main.inc.php");
 require_once(DOL_DOCUMENT_ROOT."/core/class/html.formother.class.php");
 require_once(DOL_DOCUMENT_ROOT."/core/class/html.formfile.class.php");
 require_once(DOL_DOCUMENT_ROOT."/core/class/html.formpropal.class.php");
+require_once(DOL_DOCUMENT_ROOT."/core/lib/date.lib.php");
 require_once(DOL_DOCUMENT_ROOT.'/comm/propal/class/propal.class.php');
 if ($conf->projet->enabled)   require_once(DOL_DOCUMENT_ROOT.'/projet/class/project.class.php');