diff --git a/packages/ui/package.json b/packages/ui/package.json
index 2351139..5084f4a 100755
--- a/packages/ui/package.json
+++ b/packages/ui/package.json
@@ -91,7 +91,7 @@
     ]
   },
   "main": "dist/index.js",
-  "module": "dist/ui.esm.js",
+  "module": "dist/index.esm.js",
   "peerDependencies": {
     "react": "16.x",
     "react-dom": "16.x",
diff --git a/packages/ui/tsdx.config.js b/packages/ui/tsdx.config.js
new file mode 100644
index 0000000..fdc6ed9
--- /dev/null
+++ b/packages/ui/tsdx.config.js
@@ -0,0 +1,10 @@
+module.exports = {
+  rollup(config, options) {
+    if (options.format === 'esm') {
+      config = { ...config, preserveModules: true };
+      config.output = { ...config.output, dir: 'dist/', entryFileNames: '[name].esm.js' };
+      delete config.output.file;
+    }
+    return config;
+  },
+};