diff --git a/oauth3.core.js b/oauth3.core.js
index 06aaf50..ff2f9be 100644
--- a/oauth3.core.js
+++ b/oauth3.core.js
@@ -738,10 +738,10 @@
       });
     }
   , _refreshToken: function (providerUri, opts) {
-      return OAUTH3.discover(providerUri, opts).then(function (directive) {
-        var prequest = OAUTH3.urls.refreshToken(directive, opts);
+      return OAUTH3.discover(providerUri, opts).then(function (directives) {
+        var prequest = OAUTH3.urls.refreshToken(directives, opts);
 
-        prequest.url = OAUTH3.url.resolve(providerUri/*directives.issuer*/, prequest.url);
+        prequest.url = OAUTH3.url.resolve(directives.api, prequest.url);
         return OAUTH3.request(prequest/*, { directives: directive }*/).then(function (req) {
           var data = req.data;
           data.provider_uri = providerUri;