diff --git a/lb/deno.json b/lb/deno.json
index e769fd779..e29949f87 100644
--- a/lb/deno.json
+++ b/lb/deno.json
@@ -1,7 +1,7 @@
 {
   "tasks": {
     "dev": "wrangler dev",
-    "build": "mkdir -p dist && deno bundle --output=dist/main.js --sourcemap main.ts"
+    "build": "mkdir -p dist && deno bundle --output=dist/main.js --sourcemap=linked main.ts"
   },
   "lint": {
     "rules": {