diff --git a/core/modules/comment/lib/Drupal/comment/Entity/Comment.php b/core/modules/comment/lib/Drupal/comment/Entity/Comment.php
index c2b458a..e9d54a3 100644
--- a/core/modules/comment/lib/Drupal/comment/Entity/Comment.php
+++ b/core/modules/comment/lib/Drupal/comment/Entity/Comment.php
@@ -137,7 +137,7 @@ public function preSave(EntityStorageControllerInterface $storage_controller) {
         $this->setCreatedTime(REQUEST_TIME);
       }
       if (is_null($this->getChangedTime())) {
-        $this->changed->value = $this->getCreatedTime();
+        $this->set('changed', $this->getCreatedTime());
       }
       // We test the value with '===' because we need to modify anonymous
       // users as well.