1 files changed, 1 insertions, 1 deletions
diff --git a/ext/node/polyfills/worker_threads.ts b/ext/node/polyfills/worker_threads.ts
index 24bcbe057..5ff4446f7 100644
--- a/ext/node/polyfills/worker_threads.ts
+++ b/ext/node/polyfills/worker_threads.ts
@@ -267,7 +267,7 @@ class NodeWorker extends EventEmitter {
     }
   };
 
-  postMessage(message, transferOrOptions = {}) {
+  postMessage(message, transferOrOptions = { __proto__: null }) {
     const prefix = "Failed to execute 'postMessage' on 'MessagePort'";
     webidl.requiredArguments(arguments.length, 1, prefix);
     message = webidl.converters.any(message);