diff --git a/lib/web/fetch/index.js b/lib/web/fetch/index.js
index 38bcfd3dfc2..ebc0be79d65 100644
--- a/lib/web/fetch/index.js
+++ b/lib/web/fetch/index.js
@@ -2070,6 +2070,7 @@ async function httpNetworkFetch (
       {
         body: null,
         abort: null,
+        blocking: true,
 
         onConnect (abort) {
           // TODO (fix): Do we need connection here?
diff --git a/test/wpt/runner/worker.mjs b/test/wpt/runner/worker.mjs
index 05ff38ae196..d83dfd4024e 100644
--- a/test/wpt/runner/worker.mjs
+++ b/test/wpt/runner/worker.mjs
@@ -21,10 +21,13 @@ import {
 // TODO(@KhafraDev): export these in index.js
 import { Cache } from '../../../lib/web/cache/cache.js'
 import { CacheStorage } from '../../../lib/web/cache/cachestorage.js'
+import { Agent, setGlobalDispatcher } from '../../../index.js'
 import { webcrypto } from 'node:crypto'
 
 const { initScripts, meta, test, url, path } = workerData
 
+setGlobalDispatcher(new Agent({ pipelining: 1 }))
+
 process.on('uncaughtException', (err) => {
   parentPort.postMessage({
     type: 'error',