diff --git a/oauth3.core.js b/oauth3.core.js
index ff2f9be..7f11c4c 100644
--- a/oauth3.core.js
+++ b/oauth3.core.js
@@ -297,6 +297,7 @@
           debug: opts.debug || undefined
         , client_uri: opts.client_uri || opts.clientUri || undefined
         , client_id: opts.client_id || opts.client_uri || undefined
+        , subject: opts.subject
         , state: state
         };
         var result;