diff --git a/package.json b/package.json
index 94621b9a8..135359c6e 100644
--- a/package.json
+++ b/package.json
@@ -1,11 +1,11 @@
 {
   "name": "@vue/test-utils",
-  "version": "2.0.0-rc.8",
+  "version": "2.0.0-rc.9",
   "license": "MIT",
   "main": "dist/vue-test-utils.cjs.js",
   "unpkg": "dist/vue-test-utils.browser.js",
   "types": "dist/index.d.ts",
-  "module": "dist/vue-test-utils.esm-bundler.mjs",
+  "module": "dist/vue-test-utils.esm-bundler.js",
   "files": [
     "dist",
     "README.md",
diff --git a/rollup.config.js b/rollup.config.js
index 9e031dd8c..81f7cc54d 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -55,7 +55,7 @@ function createEntry(options) {
   if (format === 'es') {
     config.output.file = pkg.module
     if (isBrowser) {
-      config.output.file = 'dist/vue-test-utils.esm-browser.mjs'
+      config.output.file = 'dist/vue-test-utils.esm-browser.js'
     }
   }
   if (format === 'cjs') {