diff --git a/package.json b/package.json
index 83949442..ea354b1e 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "derby",
   "description": "MVC framework making it easy to write realtime, collaborative applications that run in both Node.js and browsers.",
-  "version": "4.0.0-beta.11",
+  "version": "4.0.0-beta.12",
   "homepage": "http://derbyjs.com/",
   "repository": {
     "type": "git",
diff --git a/src/PageForServer.ts b/src/PageForServer.ts
index 8206faa4..85895ebb 100644
--- a/src/PageForServer.ts
+++ b/src/PageForServer.ts
@@ -90,7 +90,8 @@ function stringifyBundle(bundle) {
 
 // TODO: Cleanup; copied from tracks
 function pageParams(req) {
-  const params = Object.create(null, {
+  const params = Object.create(null);
+  Object.assign(params, {
     url: req.url,
     body: req.body,
     query: req.query,