diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index f27f5b6a516..49ee3f471cd 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -1711,7 +1711,7 @@ abstract class CommonObject
             $sql.= "(fk_source = '".$sourceid."' AND sourcetype = '".$sourcetype."')";
             $sql.= " ".$clause." (fk_target = '".$targetid."' AND targettype = '".$targettype."')";
         }
-        $sql = ' ORDER BY sourcetype';
+        $sql .= ' ORDER BY sourcetype';
         //print $sql;
 
         dol_syslog(get_class($this)."::fetchObjectLink sql=".$sql);