diff --git a/frontend/src/registerServiceWorker.js b/frontend/src/registerServiceWorker.js
index 086f184..fe7e746 100644
--- a/frontend/src/registerServiceWorker.js
+++ b/frontend/src/registerServiceWorker.js
@@ -33,7 +33,7 @@ if (process.env.NODE_ENV === 'production') {
   })
 
   let refreshing
-  navigator.serviceWorker.addEventListener("controllerchange", e=>{
+  navigator.serviceWorker.addEventListener("controllerchange", function() {
     if (refreshing) return
     window.location.reload()
     refreshing = true