diff --git a/generate-firebase-json.js b/generate-firebase-json.js
index a34db49..02beaa7 100644
--- a/generate-firebase-json.js
+++ b/generate-firebase-json.js
@@ -41,9 +41,7 @@ const generateFirebaseJson = (
     const sourceGlob = htmlPluginData.outputName
         .replace(/\.html/, '')
         .replace(/index/, '/')
-      //  .replace(/404\.html/, '**/*')
-       // .replace(/index\.html/, '\/?(index.html)?')
-       // .replace(/\.html/, '(\\.html)?')
+        .replace(/404/, '**/*');
     cspHeadersForSourceGlob = cspHeadersForSourceGlob.concat(
         [
             {