diff --git a/{{cookiecutter.out_dir}}/web/flutter_bootstrap.js b/{{cookiecutter.out_dir}}/web/flutter_bootstrap.js
index 6da2ce2..802762a 100644
--- a/{{cookiecutter.out_dir}}/web/flutter_bootstrap.js
+++ b/{{cookiecutter.out_dir}}/web/flutter_bootstrap.js
@@ -16,7 +16,7 @@ if (flet.noCdn) {
 _flutter.loader.load({
     config: flutterConfig,
     serviceWorkerSettings: {
-        serviceWorkerVersion: {{flutter_service_worker_version}},
+        serviceWorkerVersion: {{ '{{flutter_service_worker_version}}' }},
     },
     onEntrypointLoaded: async function (engineInitializer) {
         const engine = await engineInitializer.initializeEngine(flutterConfig);