diff --git a/src/vs/workbench/api/node/proxyResolver.ts b/src/vs/workbench/api/node/proxyResolver.ts
index 98f8979d9958e..0adeeb7182228 100644
--- a/src/vs/workbench/api/node/proxyResolver.ts
+++ b/src/vs/workbench/api/node/proxyResolver.ts
@@ -19,6 +19,7 @@ import type * as undiciType from 'undici-types';
 import type * as tlsType from 'tls';
 import type * as streamType from 'stream';
 import { lookupKerberosAuthorization } from '../../../platform/request/node/requestService.js';
+import * as proxyAgent from '@vscode/proxy-agent';
 
 const require = createRequire(import.meta.url);
 const http = require('http');
@@ -90,6 +91,8 @@ export function connectProxyResolver(
 		env: process.env,
 	};
 	const { resolveProxyWithRequest, resolveProxyURL } = createProxyResolver(params);
+	const target = (proxyAgent as any).default || proxyAgent;
+	target.resolveProxyURL = resolveProxyURL;
 
 	patchGlobalFetch(configProvider, mainThreadTelemetry, initData, resolveProxyURL, params.lookupProxyAuthorization!, getOrLoadAdditionalCertificates.bind(undefined, params), disposables);
 
@@ -348,7 +351,9 @@ function recordFetchFeatureUse(mainThreadTelemetry: MainThreadTelemetryShape, fe
 function createPatchedModules(params: ProxyAgentParams, resolveProxy: ResolveProxyWithRequest) {
 
 	function mergeModules(module: any, patch: any) {
-		return Object.assign(module.default || module, patch);
+		const target = module.default || module;
+		target.__vscodeOriginal = Object.assign({}, target);
+		return Object.assign(target, patch);
 	}
 
 	return {