diff --git a/build/webpack.config.js b/build/webpack.config.js
index b737bb0178..f448544dd1 100644
--- a/build/webpack.config.js
+++ b/build/webpack.config.js
@@ -19,7 +19,9 @@ const plugins = [
   new VueLoaderPlugin(),
   // new BundleAnalyzerPlugin(),
 ]
-let entry = [path.resolve(__dirname, '../packages/element-plus/index.ts')]
+
+const entry = path.resolve(__dirname, '../packages/element-plus/index.ts')
+
 if (!isFullMode) {
   externals.push({
     '@popperjs/core': '@popperjs/core',
@@ -30,8 +32,6 @@ if (!isFullMode) {
   },
   /^dayjs.*/,
   /^lodash.*/)
-} else {
-  entry.push(path.resolve(__dirname, '../packages/element-plus/full.ts'))
 }
 
 const config = {
diff --git a/packages/element-plus/full.ts b/packages/element-plus/full.ts
deleted file mode 100644
index 3e6dd8d2b8..0000000000
--- a/packages/element-plus/full.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-import dayjs from 'dayjs'
-
-// expose Day.js to window to make full bundle i18n work
-(window as any).dayjs = dayjs
diff --git a/packages/element-plus/index.ts b/packages/element-plus/index.ts
index 060ffef0bc..0f5df110ef 100644
--- a/packages/element-plus/index.ts
+++ b/packages/element-plus/index.ts
@@ -95,6 +95,13 @@ import { use, i18n } from '@element-plus/locale'
 import { version as version_ } from './version'
 import type { InstallOptions } from '@element-plus/utils/config'
 import { setConfig } from '@element-plus/utils/config'
+import isServer from '@element-plus/utils/isServer'
+import dayjs from 'dayjs'
+
+// expose Day.js to window to make full bundle i18n work
+if (!isServer && !(window as any).dayjs) {
+  (window as any).dayjs = dayjs
+}
 
 const version = version_ // version_ to fix tsc issue