diff --git a/packages/plugin-legacy/package.json b/packages/plugin-legacy/package.json
index c989393cbe9aef..81e0c3efd7f83d 100644
--- a/packages/plugin-legacy/package.json
+++ b/packages/plugin-legacy/package.json
@@ -1,6 +1,7 @@
 {
   "name": "@vitejs/plugin-legacy",
   "version": "5.4.3",
+  "type": "module",
   "license": "MIT",
   "author": "Evan You",
   "files": [