diff --git a/package.json b/package.json
index 689081d..90066d5 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   "license": "(MIT AND Zlib)",
   "repository": "nodeca/pako",
   "exports": {
-    "import": "./dist/pako.esm.js",
+    "import": "./dist/pako.esm.mjs",
     "require": "./index.js"
   },
   "scripts": {
diff --git a/rollup.config.js b/rollup.config.js
index abc298f..1b70b5c 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -80,7 +80,7 @@ export default [
   {
     input: 'index.js',
     output: [
-      { file: 'dist/pako.esm.js', format: 'esm' }
+      { file: 'dist/pako.esm.mjs', format: 'esm' }
     ],
     plugins: plugins
   }