diff --git a/build/esm.js b/build/esm.js
new file mode 100644
index 000000000..634f3aea5
--- /dev/null
+++ b/build/esm.js
@@ -0,0 +1,21 @@
+const fs = require('fs')
+const path = require('path')
+const util = require('util')
+
+const { promisify } = util
+
+const localeDir = path.join(process.env.PWD, 'esm/locale');
+
+(async () => {
+  try {
+    const readLocaleDir = await promisify(fs.readdir)(localeDir)
+    readLocaleDir.forEach(async (l) => {
+      const filePath = path.join(localeDir, l)
+      const readFile = await promisify(fs.readFile)(filePath, 'utf8')
+      const result = readFile.replace("'dayjs'", "'../index'")
+      await promisify(fs.writeFile)(filePath, result, 'utf8')
+    })
+  } catch (e) {
+    console.error(e)
+  }
+})()
diff --git a/package.json b/package.json
index e7f2af7a6..a8a682645 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "test-tz": "jest test/timezone.test --coverage=false",
     "lint": "./node_modules/.bin/eslint src/* test/* build/*",
     "prettier": "prettier --write \"docs/**/*.md\"",
-    "babel": "cross-env BABEL_ENV=build babel src --out-dir esm --copy-files",
+    "babel": "cross-env BABEL_ENV=build babel src --out-dir esm --copy-files && node build/esm",
     "build": "cross-env BABEL_ENV=build node build && npm run size",
     "sauce": "npx karma start karma.sauce.conf.js",
     "test:sauce": "npm run sauce -- 0 && npm run sauce -- 1 && npm run sauce -- 2  && npm run sauce -- 3",