diff --git a/rollup.config.mjs b/rollup.config.mjs
index b25f4567..b8868cb6 100644
--- a/rollup.config.mjs
+++ b/rollup.config.mjs
@@ -5,7 +5,7 @@ import resolve from '@rollup/plugin-node-resolve';
 export default {
     input: 'daggerheart.mjs',
     output: {
-        file: 'daggerheart.js',
+        file: 'build/daggerheart.js',
         format: 'cjs',
         sourcemap: true
     },
diff --git a/system.json b/system.json
index 87d7c951..7bd337f0 100644
--- a/system.json
+++ b/system.json
@@ -40,7 +40,7 @@
             "name": "Po0lp"
         }
     ],
-    "scripts": ["daggerheart.js"],
+    "esmodules": ["build/daggerheart.js"],
     "styles": ["styles/daggerheart.css"],
     "packs": [
         {