diff --git a/core/lib/Drupal/Core/Asset/AssetDumper.php b/core/lib/Drupal/Core/Asset/AssetDumper.php
index ed563c0..9e0470b 100644
--- a/core/lib/Drupal/Core/Asset/AssetDumper.php
+++ b/core/lib/Drupal/Core/Asset/AssetDumper.php
@@ -26,7 +26,7 @@ public function dump($data, $file_extension, $uri = NULL) {
     if (!isset($uri)) {
       // Prefix filename to prevent blocking by firewalls which reject files
       // starting with "ad*".
-      $filename = $file_extension . '_' . $group . '_' . Crypt::hashBase64($data) . '.' . $file_extension;
+      $filename = $file_extension . '_' . Crypt::hashBase64($data) . '.' . $file_extension;
       // Create the css/ or js/ path within the files folder.
       $path = 'public://' . $file_extension;
       $uri = $path . '/' . $filename;