diff --git a/htdocs/compta/sociales/list.php b/htdocs/compta/sociales/list.php
index 8893447ebf3..01efe621dc8 100644
--- a/htdocs/compta/sociales/list.php
+++ b/htdocs/compta/sociales/list.php
@@ -28,6 +28,7 @@ require '../../main.inc.php';
 require_once DOL_DOCUMENT_ROOT.'/compta/sociales/class/chargesociales.class.php';
 require_once DOL_DOCUMENT_ROOT.'/core/class/html.formsocialcontrib.class.php';
 require_once DOL_DOCUMENT_ROOT.'/core/class/html.formother.class.php';
+require_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
 
 // Load translation files required by the page
 $langs->loadLangs(array('compta', 'banks', 'bills'));