diff --git a/htdocs/telephonie/client/pre.inc.php b/htdocs/telephonie/client/pre.inc.php
index 72c169e9701..659aea67f6a 100644
--- a/htdocs/telephonie/client/pre.inc.php
+++ b/htdocs/telephonie/client/pre.inc.php
@@ -21,6 +21,7 @@
  */
 require("../../main.inc.php");
 require(DOL_DOCUMENT_ROOT."/telephonie/lignetel.class.php");
+require(DOL_DOCUMENT_ROOT."/telephonie/telephonie.client.class.php");
 
 $user->getrights('telephonie');