diff --git a/bin/build-vercel-json.js b/bin/build-vercel-json.js
index bb4b3d25..609d36bd 100644
--- a/bin/build-vercel-json.js
+++ b/bin/build-vercel-json.js
@@ -21,7 +21,7 @@ const JSON_TEMPLATE = {
   github: {
     silent: true
   },
-  "buildCommand": "yarn build",
+  buildCommand: 'yarn build',
   routes: [
     {
       src: '^/service-worker\\.js$',