diff --git a/lib/vscode/src/vs/server/browser/client.ts b/lib/vscode/src/vs/server/browser/client.ts
index 8a92b722b..685030c33 100644
--- a/lib/vscode/src/vs/server/browser/client.ts
+++ b/lib/vscode/src/vs/server/browser/client.ts
@@ -102,7 +102,7 @@ export const initialize = async (services: ServiceCollection): Promise<void> =>
 
 	if (parent) {
 		// Tell the parent loading has completed.
-		parent.postMessage({ event: 'loaded' }, window.location.origin);
+		parent.postMessage({ event: 'loaded' }, '*');
 
 		// Proxy or stop proxing events as requested by the parent.
 		const listeners = new Map<string, (event: Event) => void>();