diff --git a/src/Form/MergeTermsConfirm.php b/src/Form/MergeTermsConfirm.php
index 28305c3..537783d 100644
--- a/src/Form/MergeTermsConfirm.php
+++ b/src/Form/MergeTermsConfirm.php
@@ -35,21 +35,21 @@ class MergeTermsConfirm extends FormBase {
    *
    * @var \Drupal\user\PrivateTempStoreFactory
    */
-  private $tempStoreFactory;
+  protected $tempStoreFactory;
 
   /**
    * The term merger.
    *
    * @var \Drupal\term_merge\TermMergerInterface
    */
-  private $termMerger;
+  protected $termMerger;
 
   /**
    * The vocabulary.
    *
    * @var \Drupal\taxonomy\VocabularyInterface
    */
-  private $vocabulary;
+  protected $vocabulary;
 
   /**
    * Constructs an OverviewTerms object.