diff --git a/authorization_code/app.js b/authorization_code/app.js
index 4f72903..588dea1 100644
--- a/authorization_code/app.js
+++ b/authorization_code/app.js
@@ -76,9 +76,10 @@ app.get('/callback', function(req, res) {
       form: {
         code: code,
         redirect_uri: redirect_uri,
-        grant_type: 'authorization_code',
-        client_id: client_id,
-        client_secret: client_secret
+        grant_type: 'authorization_code'
+      },
+      headers: {
+        'Authorization': 'Basic ' + (new Buffer(client_id + ':' + client_secret).toString('base64'))
       },
       json: true
     };