diff --git a/packages/ui-default/handler.ts b/packages/ui-default/handler.ts
index cf9ccd55..49ea29e9 100644
--- a/packages/ui-default/handler.ts
+++ b/packages/ui-default/handler.ts
@@ -7,6 +7,7 @@ import * as bus from 'hydrooj/src/service/bus';
 import { Route, Handler } from 'hydrooj/src/service/server';
 import { PERM, PRIV } from 'hydrooj/src/model/builtin';
 import esbuild from 'esbuild';
+import { tmpdir } from 'os';
 import markdown from './backendlib/markdown';
 
 const {
@@ -19,6 +20,7 @@ const build = esbuild.buildSync({
   format: 'iife',
   entryPoints: pageFiles.map((i) => join(global.Hydro.ui.manifest[i], i)),
   bundle: true,
+  outdir: tmpdir(),
   splitting: false,
   write: false,
   minify: !process.env.DEV,
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index 27c8e1fc..633745e6 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.34.21",
+  "version": "4.34.22",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",