diff --git a/htdocs/adherents/index.php b/htdocs/adherents/index.php
index 27b3403efa0..fd10d0e14de 100644
--- a/htdocs/adherents/index.php
+++ b/htdocs/adherents/index.php
@@ -27,6 +27,7 @@
 require '../main.inc.php';
 require_once DOL_DOCUMENT_ROOT.'/adherents/class/adherent.class.php';
 require_once DOL_DOCUMENT_ROOT.'/adherents/class/adherent_type.class.php';
+require_once DOL_DOCUMENT_ROOT.'/adherents/class/cotisation.class.php';
 
 $langs->load("companies");
 $langs->load("members");