diff --git a/src/Core/Destination/DirectoryDestination.php b/src/Core/Destination/DirectoryDestination.php
index ea3d0ea..cbe07da 100644
--- a/src/Core/Destination/DirectoryDestination.php
+++ b/src/Core/Destination/DirectoryDestination.php
@@ -233,10 +233,11 @@ protected function getAllFileNames() {
 
     // Read the list of files from the directory.
     $dir = $this->confGet('directory');
+    $scheme = 
 
     /** @var \Drupal\Core\StreamWrapper\StreamWrapperManagerInterface $stream_wrapper_manager */
     $stream_wrapper_manager = \Drupal::service('stream_wrapper_manager');
-    $scheme = $stream_wrapper_manager->isValidScheme($dir);
+    $scheme = $stream_wrapper_manager->getScheme($dir);
 
     // Ensure the stream is configured.
     if (!$stream_wrapper_manager->isValidScheme($scheme)) {
diff --git a/tests/src/Functional/BackupMigrateQuickBackupTest.php b/tests/src/Functional/BackupMigrateQuickBackupTest.php
index 5fdec3d..c0def10 100644
--- a/tests/src/Functional/BackupMigrateQuickBackupTest.php
+++ b/tests/src/Functional/BackupMigrateQuickBackupTest.php
@@ -38,7 +38,10 @@ public function setUp() {
       'perform backup',
       'access backup files',
       'administer backup and migrate',
+      // Required for the file admin page.
+      'administer site configuration',
     ]));
+    $this->drupalGet('admin/config/media/file-system');
   }
 
   /**