diff --git a/lib/omb.php b/lib/omb.php
index 43184a0fed..e9108e3e75 100644
--- a/lib/omb.php
+++ b/lib/omb.php
@@ -22,6 +22,10 @@ if (!defined('LACONICA')) { exit(1); }
 require_once('OAuth.php');
 require_once(INSTALLDIR.'/lib/oauthstore.php');
 
+require_once(INSTALLDIR.'/classes/Consumer.php');
+require_once(INSTALLDIR.'/classes/Nonce.php');
+require_once(INSTALLDIR.'/classes/Token.php');
+
 define('OAUTH_NAMESPACE', 'http://oauth.net/core/1.0/');
 define('OMB_NAMESPACE', 'http://openmicroblogging.org/protocol/0.1');
 define('OMB_VERSION_01', 'http://openmicroblogging.org/protocol/0.1');