diff --git a/ext/node/polyfills/worker_threads.ts b/ext/node/polyfills/worker_threads.ts
index 74abf5bb5f0fcf..2e379cfaf49016 100644
--- a/ext/node/polyfills/worker_threads.ts
+++ b/ext/node/polyfills/worker_threads.ts
@@ -409,6 +409,7 @@ internals.__initWorkerThreads = (runningOnMainThread: boolean) => {
     >();
 
     parentPort = self as ParentPort;
+    defaultExport.parentPort = parentPort;
 
     const initPromise = PromisePrototypeThen(
       once(