diff -u b/core/lib/Drupal/Component/Gettext/PoMemoryWriter.php b/core/lib/Drupal/Component/Gettext/PoMemoryWriter.php
--- b/core/lib/Drupal/Component/Gettext/PoMemoryWriter.php
+++ b/core/lib/Drupal/Component/Gettext/PoMemoryWriter.php
@@ -12,7 +12,7 @@
    *
    * @var array
    */
-  private $items;
+  protected $items;
 
   /**
    * Constructor, initialize empty items.
diff -u b/core/lib/Drupal/Component/Gettext/PoStreamReader.php b/core/lib/Drupal/Component/Gettext/PoStreamReader.php
--- b/core/lib/Drupal/Component/Gettext/PoStreamReader.php
+++ b/core/lib/Drupal/Component/Gettext/PoStreamReader.php
@@ -577,7 +577,7 @@
    * @return
    *   Short one-string version of the comment.
    */
-  protected function shortenComments($comment) {
+  private function shortenComments($comment) {
     $comm = '';
     while (count($comment)) {
       $test = $comm . substr(array_shift($comment), 1) . ', ';