diff --git a/nocss/package.json b/nocss/package.json
index 719fc50b..1b4862c6 100644
--- a/nocss/package.json
+++ b/nocss/package.json
@@ -1,6 +1,7 @@
 {
   "internal": true,
+  "type": "module",
   "main": "../dist/nocss/ReactFlow-nocss.js",
-  "module": "../dist/nocss/ReactFlow-nocss.esm.js",
+  "module": "../dist/nocss/ReactFlow-nocss.js",
   "types": "../dist/nocss/index.d.ts"
 }
diff --git a/rollup.config.js b/rollup.config.js
index b8ae6363..f77e8598 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -77,7 +77,7 @@ export default isProd && !isTesting
   ? [
       baseConfig(),
       baseConfig({
-        outputFile: 'dist/nocss/ReactFlow-nocss.esm.js',
+        outputFile: 'dist/nocss/ReactFlow-nocss.js',
         injectCSS: false,
       }),
     ]