diff --git a/lib/openid.php b/lib/openid.php
index f03dc6a2af..9128ecddcc 100644
--- a/lib/openid.php
+++ b/lib/openid.php
@@ -19,6 +19,8 @@
 
 if (!defined('LACONICA')) { exit(1); }
 
+require_once(INSTALLDIR.'/classes/User_openid.php');
+
 require_once('Auth/OpenID.php');
 require_once('Auth/OpenID/Consumer.php');
 require_once('Auth/OpenID/SReg.php');