diff --git a/core/lib/Drupal/Core/FileTransfer/FileTransfer.php b/core/lib/Drupal/Core/FileTransfer/FileTransfer.php
index f214fef18f..26fd98b342 100644
--- a/core/lib/Drupal/Core/FileTransfer/FileTransfer.php
+++ b/core/lib/Drupal/Core/FileTransfer/FileTransfer.php
@@ -51,14 +51,14 @@ abstract class FileTransfer {
   /**
    * Path to connection chroot.
    *
-   * @var string|false
+   * @var string|false|null
    */
   private $chrootPath;
 
   /**
    * The instantiated connection object.
    *
-   * @var object|false
+   * @var object|false|null
    */
   private $connectionHandle;