diff --git a/src/rollup/config.ts b/src/rollup/config.ts
index 5594d92b00..9f6fd07e13 100644
--- a/src/rollup/config.ts
+++ b/src/rollup/config.ts
@@ -19,7 +19,7 @@ import { dynamicRequire } from './plugins/dynamic-require'
 import { externals } from './plugins/externals'
 import { timing } from './plugins/timing'
 import { autoMock } from './plugins/automock'
-import { staticAssets } from './plugins/static'
+import { staticAssets, dirnames } from './plugins/static'
 import { middleware } from './plugins/middleware'
 import { esbuild } from './plugins/esbuild'
 
@@ -128,6 +128,7 @@ export const getRollupConfig = (sigmaContext: SigmaContext) => {
 
   // Static
   if (sigmaContext.serveStatic) {
+    rollupConfig.plugins.push(dirnames())
     rollupConfig.plugins.push(staticAssets(sigmaContext))
   }
 
diff --git a/src/rollup/plugins/static.ts b/src/rollup/plugins/static.ts
index 9f27ef3964..095416be40 100644
--- a/src/rollup/plugins/static.ts
+++ b/src/rollup/plugins/static.ts
@@ -4,6 +4,7 @@ import mime from 'mime'
 import { relative, resolve } from 'upath'
 import virtual from '@rollup/plugin-virtual'
 import globby from 'globby'
+import type { Plugin } from 'rollup'
 import type { SigmaContext } from '../../context'
 
 export function staticAssets (context: SigmaContext) {
@@ -29,14 +30,12 @@ export function staticAssets (context: SigmaContext) {
   return virtual({
     '~static-assets': `export default ${JSON.stringify(assets, null, 2)};`,
     '~static': `
-import { readFile } from 'fs/promises'
-import { resolve, dirname } from 'path'
+import { promises } from 'fs'
+import { resolve } from 'path'
 import assets from '~static-assets'
 
-const mainDir = dirname(require.main.filename)
-
 export function readAsset (id) {
-  return readFile(resolve(mainDir, getAsset(id).path))
+  return promises.readFile(resolve(mainDir, getAsset(id).path))
 }
 
 export function getAsset (id) {
@@ -45,3 +44,12 @@ export function getAsset (id) {
 `
   })
 }
+
+export function dirnames (): Plugin {
+  return {
+    name: 'dirnames',
+    renderChunk (code, chunk) {
+      return code + (chunk.isEntry ? 'global.mainDir="undefined"!=typeof __dirname?__dirname:require.main.filename;' : '')
+    }
+  }
+}