diff --git a/src/store/indexeddb.js b/src/store/indexeddb.js
index 18280c5e4..e34e4f680 100644
--- a/src/store/indexeddb.js
+++ b/src/store/indexeddb.js
@@ -82,7 +82,7 @@ const IndexedDBStore = function IndexedDBStore(opts) {
         throw new Error('Missing required option: indexedDB');
     }
 
-    if (opts.workerScript) {
+    if (opts.workerScript && window.Worker) {
         this.backend = new RemoteIndexedDBStoreBackend(opts.workerScript, opts.dbName);
     } else {
         this.backend = new LocalIndexedDBStoreBackend(opts.indexedDB, opts.dbName);