diff --git a/htdocs/soc.php b/htdocs/soc.php
index 4a9fa3ba1bf..81bea4e7d6a 100644
--- a/htdocs/soc.php
+++ b/htdocs/soc.php
@@ -29,6 +29,7 @@
 
 require("pre.inc.php");
 require_once(DOL_DOCUMENT_ROOT."/lib/company.lib.php");
+require_once(DOL_DOCUMENT_ROOT."/contact.class.php");
 
 $langs->load("companies");
 $langs->load("commercial");