diff --git a/htdocs/telephonie/contrat/pre.inc.php b/htdocs/telephonie/contrat/pre.inc.php
index a886a8f762f..d70d21aaf51 100644
--- a/htdocs/telephonie/contrat/pre.inc.php
+++ b/htdocs/telephonie/contrat/pre.inc.php
@@ -23,6 +23,7 @@ require("../../main.inc.php");
 
 require(DOL_DOCUMENT_ROOT."/telephonie/lignetel.class.php");
 require(DOL_DOCUMENT_ROOT."/telephonie/telephonie.contrat.class.php");
+require(DOL_DOCUMENT_ROOT."/telephonie/telephonie.client.class.php");
 
 $user->getrights('telephonie');