diff --git a/extlib/libomb/omb_yadis_xrds.php b/extlib/libomb/omb_yadis_xrds.php
index b84752c4c5..a05477c103 100755
--- a/extlib/libomb/omb_yadis_xrds.php
+++ b/extlib/libomb/omb_yadis_xrds.php
@@ -155,7 +155,7 @@ class OMB_Yadis_XRDS extends Auth_Yadis_XRDS
      * @return mixed An instance of OMB_Yadis_XRDS or null,
      *               depending on the validity of $xml_string
      */
-    public function parseXRDS($xml_string, $extra_ns_map = null)
+    public static function parseXRDS($xml_string, $extra_ns_map = null)
     {
         $_null = null;