diff --git a/htdocs/core/actions_massactions.inc.php b/htdocs/core/actions_massactions.inc.php
index 703fd5d4771..5e803ae3cdf 100644
--- a/htdocs/core/actions_massactions.inc.php
+++ b/htdocs/core/actions_massactions.inc.php
@@ -1656,6 +1656,7 @@ if (!$error && ($massaction == 'approveleave' || ($action == 'approveleave' && $
 
 						$trackid = 'leav'.$objecttmp->id;
 
+						require_once DOL_DOCUMENT_ROOT.'/core/class/CMailFile.class.php';
 						$mail = new CMailFile($subject, $emailTo, $emailFrom, $message, array(), array(), array(), '', '', 0, 0, '', '', $trackid);
 
 						// Sending email