diff --git a/next.html b/next.html
index 736b31a..7a1bffa 100644
--- a/next.html
+++ b/next.html
@@ -33,7 +33,7 @@
 	<!-- Serviceworker script that adds the COI and CORS headers to the response headers in cases where the server does not support it. -->
 	<script src="serviceWorker.js"></script>
 	<script src="network.js"></script>
-	<script defer src='/build/bundle.js'></script>
+	<script defer src='/build/bundle.js' type='module'></script>
 </head>
 
 <body>
diff --git a/rollup.config.js b/rollup.config.js
index ae962dd..9f1a028 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -14,7 +14,7 @@ export default {
 	input: 'src/main.js',
 	output: {
 		sourcemap: true,
-		format: 'iife',
+		format: 'esm',
 		name: 'app',
 		file: 'build/bundle.js'
 	},
