diff --git a/src/Symfony/Component/AssetMapper/Tests/ImportMap/RemotePackageStorageTest.php b/src/Symfony/Component/AssetMapper/Tests/ImportMap/RemotePackageStorageTest.php
index 7c0f1541a85ed..82b0bd6b5be81 100644
--- a/src/Symfony/Component/AssetMapper/Tests/ImportMap/RemotePackageStorageTest.php
+++ b/src/Symfony/Component/AssetMapper/Tests/ImportMap/RemotePackageStorageTest.php
@@ -62,7 +62,9 @@ public function testSaveThrowsWhenFailing()
             $storage->save($entry, 'any content');
         } finally {
             if ('\\' === \DIRECTORY_SEPARATOR) {
-                $this->filesystem->chmod($vendorDir.'/module_specifier/module_specifier.index.js', 0777);
+                foreach (glob($vendorDir.'/module_specifier/*') as $file) {
+                    $this->filesystem->chmod($file, 0777);
+                }
             } else {
                 $this->filesystem->chmod($vendorDir.'/module_specifier/', 0777);
             }