diff --git a/lib/PageForServer.js b/lib/PageForServer.js
index 26d185c8..b7d6f29c 100644
--- a/lib/PageForServer.js
+++ b/lib/PageForServer.js
@@ -81,7 +81,8 @@ function stringifyBundle(bundle) {
 
 // TODO: Cleanup; copied from tracks
 function pageParams(req) {
-  var params = Object.create(null, {
+  var params = Object.create(null)
+  Object.assign(params, {
     url: req.url,
     body: req.body,
     query: req.query,