diff --git a/core/modules/comment/src/Plugin/Field/FieldFormatter/AuthorNameFormatter.php b/core/modules/comment/src/Plugin/Field/FieldFormatter/AuthorNameFormatter.php
index 0a2a0ca..8bb550e 100644
--- a/core/modules/comment/src/Plugin/Field/FieldFormatter/AuthorNameFormatter.php
+++ b/core/modules/comment/src/Plugin/Field/FieldFormatter/AuthorNameFormatter.php
@@ -42,6 +42,9 @@ public function viewElements(FieldItemListInterface $items) {
       $elements[$delta] = array(
         '#theme' => 'username',
         '#account' => $account,
+        '#cache' => array(
+          'tags' => $account->getCacheTags() + $comment->getCacheTags(),
+        ),
       );
     }