diff --git a/src/Adapter.php b/src/Adapter.php
index b4777f9..33d8487 100644
--- a/src/Adapter.php
+++ b/src/Adapter.php
@@ -271,12 +271,8 @@ public function deleteDir($dirname)
             return true;
         }
 
-        $keys = array_map(function ($item) {
-            return ['Key' => $item['Key']];
-        }, (array) $response['Contents']);
-
         // ignore directory
-        $keys = array_filter($keys, function ($item) {
+        $keys = array_filter((array) $response['Contents'], function ($item) {
             return substr($item['Key'], -1) !== '/';
         });
 
@@ -284,6 +280,10 @@ public function deleteDir($dirname)
             return true;
         }
 
+        $keys = array_map(function ($item) {
+            return ['Key' => $item['Key']];
+        }, $keys);
+
         return (bool) $this->client->deleteObjects([
             'Bucket' => $this->getBucket(),
             'Key' => $keys,