diff --git a/tools/build.mjs b/tools/build.mjs
index 24dca50724..8c7f198962 100644
--- a/tools/build.mjs
+++ b/tools/build.mjs
@@ -1,7 +1,15 @@
 #!/usr/bin/env zx
 
 import { chalk } from 'zx';
-import { applyPatches, buildAIO, copyLocalizedFiles, copyRobots, modifySitemap, resetBuildDir } from './lib/common.mjs';
+import {
+  applyPatches,
+  buildAIO,
+  copyLocalizedFiles,
+  remove404HTML,
+  copyRobots,
+  modifySitemap,
+  resetBuildDir,
+} from './lib/common.mjs';
 
 try {
   console.log(chalk.green('==== setup ===='));
@@ -38,5 +46,6 @@ async function build() {
 
 async function postBuild() {
   await copyRobots();
+  await remove404HTML();
   await modifySitemap();
 }
diff --git a/tools/lib/common.mjs b/tools/lib/common.mjs
index 2d39c34ce5..c320677dad 100644
--- a/tools/lib/common.mjs
+++ b/tools/lib/common.mjs
@@ -1,7 +1,7 @@
 import { watch } from 'chokidar';
 import { resolve } from 'node:path';
 import { $, cd, chalk, glob, within } from 'zx';
-import { initDir, cpRf, exists, sed } from './fileutils.mjs';
+import { initDir, cpRf, exists, sed, rmrf, rename } from './fileutils.mjs';
 
 const rootDir = resolve(__dirname, '../');
 const aiojaDir = resolve(rootDir, 'aio-ja');
@@ -102,3 +102,11 @@ export async function modifySitemap() {
   const sitemapPath = resolve(outDir, 'dist/bin/aio/build/generated/sitemap.xml');
   await sed(sitemapPath, 'angular.io', 'angular.jp');
 }
+
+// copy _redirects
+export async function remove404HTML() {
+  await $`chmod -R +w ${resolve(outDir, 'dist/bin/aio/build')}`;
+  const from = resolve(outDir, 'dist/bin/aio/build/404.html');
+  const to = resolve(outDir, 'dist/bin/aio/build/_404.html');
+  await rename(from, to);
+}
diff --git a/tools/lib/fileutils.mjs b/tools/lib/fileutils.mjs
index ebf2f99ea2..01ee1b8825 100644
--- a/tools/lib/fileutils.mjs
+++ b/tools/lib/fileutils.mjs
@@ -26,3 +26,8 @@ export async function sed(path, pattern, replacement) {
   const newContent = content.replaceAll(pattern, replacement);
   await writeFile(path, newContent, 'utf-8');
 }
+
+export async function rename(oldPath, newPath) {
+  await cp(oldPath, newPath);
+  await rm(oldPath);
+}