diff --git a/generateChr_manifest.ts b/generateChr_manifest.ts
index ed789d5..32e37b2 100644
--- a/generateChr_manifest.ts
+++ b/generateChr_manifest.ts
@@ -34,7 +34,7 @@ export async function generateChr_manifest(
   "manifest_version": 3,
   "description": "${layout.language} ${layout.name} v${layout.version}",
   "background": {
-    "service_worker": ["background.js"]
+    "service_worker": "background.js"
   },
   "icons": {
     "16": "icon16.png",
diff --git a/output/Manoonchai/thaimnc/manifest.json b/output/Manoonchai/thaimnc/manifest.json
index 939faed..c8925b6 100644
--- a/output/Manoonchai/thaimnc/manifest.json
+++ b/output/Manoonchai/thaimnc/manifest.json
@@ -4,7 +4,7 @@
   "manifest_version": 3,
   "description": "Thai Manoonchai v1.0",
   "background": {
-    "service_worker": ["background.js"]
+    "service_worker": "background.js"
   },
   "icons": {
     "16": "icon16.png",