diff --git a/README.md b/README.md
index 7bb90c7..40b6b3d 100755
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ Limitations:
 
 `src/main.ts` is built and bundled into `build/bundle/`.
 
-To disable source maps, disable `buildOptions.sourceMaps` in `snowpack.config.js`.
+To disable source maps, disable `buildOptions.sourcemap` in `snowpack.config.js`.
 
 ## Commands
 
diff --git a/snowpack.config.js b/snowpack.config.js
index 5e4a4e1..96438a2 100755
--- a/snowpack.config.js
+++ b/snowpack.config.js
@@ -12,7 +12,7 @@ module.exports = {
   },
   buildOptions: {
     out: './build',
-    sourcemap: true,
+    sourcemap: process.env.NODE_ENV === 'development',
     clean: true,
   },
   optimize: {