diff --git a/src/vs/workbench/api/browser/mainThreadWindow.ts b/src/vs/workbench/api/browser/mainThreadWindow.ts
index a0ad6dbd0e1..79cf2c48a96 100644
--- a/src/vs/workbench/api/browser/mainThreadWindow.ts
+++ b/src/vs/workbench/api/browser/mainThreadWindow.ts
@@ -4,7 +4,7 @@
  *--------------------------------------------------------------------------------------------*/
 
 import { Event } from 'vs/base/common/event';
-import { DisposableStore, IDisposable } from 'vs/base/common/lifecycle';
+import { DisposableStore } from 'vs/base/common/lifecycle';
 import { URI, UriComponents } from 'vs/base/common/uri';
 import { IOpenerService } from 'vs/platform/opener/common/opener';
 import { extHostNamedCustomer, IExtHostContext } from 'vs/workbench/services/extensions/common/extHostCustomers';
@@ -16,7 +16,6 @@ export class MainThreadWindow implements MainThreadWindowShape {
 
 	private readonly proxy: ExtHostWindowShape;
 	private readonly disposables = new DisposableStore();
-	private readonly resolved = new Map<number, IDisposable>();
 
 	constructor(
 		extHostContext: IExtHostContext,
@@ -31,11 +30,6 @@ export class MainThreadWindow implements MainThreadWindowShape {
 
 	dispose(): void {
 		this.disposables.dispose();
-
-		for (const value of this.resolved.values()) {
-			value.dispose();
-		}
-		this.resolved.clear();
 	}
 
 	$getWindowVisibility(): Promise<boolean> {