diff --git a/packages/builder/vite.config.js b/packages/builder/vite.config.js
index b68d265bc5..47fed87e1e 100644
--- a/packages/builder/vite.config.js
+++ b/packages/builder/vite.config.js
@@ -15,6 +15,7 @@ export default ({ mode }) => {
     build: {
       minify: isProduction,
       outDir: "../server/builder",
+      sourcemap: !isProduction,
     },
     plugins: [
       svelte({