--- a/lib/openid-php/Auth/OpenID/TrustRoot.php
+++ b/lib/openid-php/Auth/OpenID/TrustRoot.php
@@ -413,7 +413,7 @@
     }
 
     call_user_func_array($discover_function,
-                         array($relying_party_url, &$fetcher));
+                         array($relying_party_url, $fetcher));
 
     $return_to_urls = array();
     $matching_endpoints = Auth_OpenID_extractReturnURL($endpoints);