diff --git a/packages/vite/src/manifest.ts b/packages/vite/src/manifest.ts
index 154d50edbe..00a4cf98cf 100644
--- a/packages/vite/src/manifest.ts
+++ b/packages/vite/src/manifest.ts
@@ -36,12 +36,13 @@ export async function writeManifest (ctx: ViteBuildContext, css: string[] = [])
   const BASE_RE = new RegExp(`^${escapeRE(buildAssetsDir)}`)
 
   for (const key in clientManifest) {
-    if (clientManifest[key].file) {
-      clientManifest[key].file = clientManifest[key].file.replace(BASE_RE, '')
+    const entry = clientManifest[key]
+    if (entry.file) {
+      entry.file = entry.file.replace(BASE_RE, '')
     }
     for (const item of ['css', 'assets']) {
-      if (clientManifest[key][item]) {
-        clientManifest[key][item] = clientManifest[key][item].map((i: string) => i.replace(BASE_RE, ''))
+      if (entry[item]) {
+        entry[item] = entry[item].map((i: string) => i.replace(BASE_RE, ''))
       }
     }
   }