diff --git a/package.json b/package.json
index 5c064f6..2f431d0 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "README.md"
   ],
   "scripts": {
-    "build": "npx esbuild src/index.js --bundle --minify --outfile=dist/index.js --format=esm && npx rollup -c",
+    "build": "npx esbuild src/index.js --sourcemap --bundle --minify --outfile=dist/index.js --format=esm && npx rollup -c",
     "test": "vitest",
     "cover": "vitest --coverage",
     "format": "prettier . --write"