diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 6439e3e003e..e363eda6e4a 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -575,6 +575,9 @@ abstract class CommonObject
         global $conf;
 
         if (empty($this->socid)) return 0;
+        
+        if (!class_exists('Societe'))
+	    require_once DOL_DOCUMENT_ROOT.'/societe/class/societe.class.php';
 
         $thirdparty = new Societe($this->db);
         $result=$thirdparty->fetch($this->socid);