diff --git a/vue.config.js b/vue.config.js
index 6e097f49..4d98222c 100644
--- a/vue.config.js
+++ b/vue.config.js
@@ -76,7 +76,7 @@ module.exports = {
     workboxOptions: {
       runtimeCaching: [{
         urlPattern: /.*/,
-        handler: 'networkFirst',
+        handler: 'NetworkFirst',
         options: {
           cacheName: 'PPTist',
           expiration: {