diff --git a/htdocs/product/index.php b/htdocs/product/index.php
index f9eb16e23de..6104702f6cd 100644
--- a/htdocs/product/index.php
+++ b/htdocs/product/index.php
@@ -25,6 +25,7 @@
 
 require '../main.inc.php';
 require_once DOL_DOCUMENT_ROOT.'/product/class/product.class.php';
+require_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
 
 $type=isset($_GET["type"])?$_GET["type"]:(isset($_POST["type"])?$_POST["type"]:'');
 if ($type =='' && !$user->rights->produit->lire) $type='1';	// Force global page on service page only