diff --git a/src/vs/workbench/services/extensions/common/polyfillNestedWorker.protocol.ts b/src/vs/workbench/services/extensions/common/polyfillNestedWorker.protocol.ts
index 0fce59a39ecdf0e08ed9057a2d166646688bace1..be78ebd122b6e3d993224a00c16d9a3d7ace6ee1 100644
--- a/src/vs/workbench/services/extensions/common/polyfillNestedWorker.protocol.ts
+++ b/src/vs/workbench/services/extensions/common/polyfillNestedWorker.protocol.ts
@@ -7,9 +7,9 @@
 export interface NewWorkerMessage {
 	type: '_newWorker';
 	id: string;
-	port: MessagePort;
+	port: any /* MessagePort */;
 	url: string;
-	options: WorkerOptions | undefined
+	options: any /* WorkerOptions */ | undefined;
 }
 
 export interface TerminateWorkerMessage {