diff --git a/service-worker.js b/service-worker.js
index 7c7fa5de5..8e8136744 100644
--- a/service-worker.js
+++ b/service-worker.js
@@ -125,6 +125,8 @@ const precacheFiles = [
     'www/js/lib/abstractFilesystemAccess.js',
     'www/js/lib/arrayFromPolyfill.js',
     'www/js/lib/filecache.js',
+    'www/js/lib/cache.js',
+    'www/js/lib/fileSystem.js',
     'www/js/lib/promisePolyfill.js',
     'www/js/lib/settingsStore.js',
     'www/js/lib/translateUI.js',