diff --git a/src/Illuminate/Cache/CacheManager.php b/src/Illuminate/Cache/CacheManager.php
index a9dcb2b1fa2b..f0f0b392e9ae 100755
--- a/src/Illuminate/Cache/CacheManager.php
+++ b/src/Illuminate/Cache/CacheManager.php
@@ -286,7 +286,7 @@ protected function newDynamodbClient(array $config)
      * @param  array  $config
      * @return \Illuminate\Cache\Repository
      */
-    public function repository(Store $store, array $config)
+    public function repository(Store $store, array $config = [])
     {
         return tap(new Repository($store, Arr::only($config, ['store'])), function ($repository) {
             $this->setEventDispatcher($repository);