diff --git a/package.json b/package.json
index 5b6afed1..f59ee5ca 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "license": "MIT",
   "repository": "git://github.com/ianstormtaylor/superstruct.git",
   "type": "module",
-  "main": "./dist/index.cjs",
+  "main": "./dist/index.js",
   "module": "./dist/index.mjs",
   "types": "./dist/index.d.ts",
   "sideEffects": false,
diff --git a/rollup.config.js b/rollup.config.js
index aeb0c858..3e56d302 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -11,7 +11,7 @@ export default defineConfig({
       sourcemap: true,
     },
     {
-      file: './dist/index.cjs',
+      file: './dist/index.js',
       format: 'umd',
       name: 'Superstruct',
       sourcemap: true,