diff --git a/ext/runtime/js/bootstrap.js b/ext/runtime/js/bootstrap.js
index 765d296c..9035efc3 100644
--- a/ext/runtime/js/bootstrap.js
+++ b/ext/runtime/js/bootstrap.js
@@ -263,6 +263,7 @@ const globalScope = {
   performance: writable(performance.performance),
 
   // messagePort
+  MessagePort: nonEnumerable(messagePort.MessagePort),
   MessageChannel: nonEnumerable(messagePort.MessageChannel),
   structuredClone: writable(messagePort.structuredClone),
 
@@ -768,7 +769,6 @@ globalThis.bootstrapSBEdge = (opts, ctx) => {
     });
   }
 
-  const nodeBootstrap = globalThis.nodeBootstrap;
   if (nodeBootstrap) {
     nodeBootstrap({
       runningOnMainThread: true,
@@ -783,6 +783,8 @@ globalThis.bootstrapSBEdge = (opts, ctx) => {
   delete globalThis.bootstrapSBEdge;
 };
 
+const nodeBootstrap = globalThis.nodeBootstrap;
+
 globalThis.bootstrap = {
   dispatchLoadEvent,
   dispatchUnloadEvent,
@@ -794,3 +796,4 @@ globalThis.bootstrap = {
 
 core.setUnhandledPromiseRejectionHandler(processUnhandledPromiseRejection);
 core.setHandledPromiseRejectionHandler(processRejectionHandled);
+nodeBootstrap({ warmup: true });