diff --git a/core/lib/Drupal/Core/Entity/ContentEntityBase.php b/core/lib/Drupal/Core/Entity/ContentEntityBase.php
index e242544..273fad6 100644
--- a/core/lib/Drupal/Core/Entity/ContentEntityBase.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityBase.php
@@ -1280,10 +1280,11 @@ public function hasTranslationChanges() {
     foreach ($this->getFieldDefinitions() as $field_name => $definition) {
       // @todo Avoid special-casing the following fields. See
       //    https://www.drupal.org/node/2329253.
-      if ($field_name == 'revision_translation_affected' || $field_name == 'revision_id') {
+      $revision_field_name = $this->getEntityType()->getKey('revision');
+      if ($field_name == 'revision_translation_affected' || $field_name == $revision_field_name) {
         continue;
       }
-      if (!$definition->isComputed() && (!$translated || $definition->isTranslatable())) {
+      if (!$definition->isComputed()) {
         $items = $this->get($field_name)->filterEmptyItems();
         $original_items = $translation->get($field_name)->filterEmptyItems();
         if (!$items->equals($original_items)) {
diff --git a/core/lib/Drupal/Core/Entity/ContentEntityInterface.php b/core/lib/Drupal/Core/Entity/ContentEntityInterface.php
index 8893a8b..d045152 100644
--- a/core/lib/Drupal/Core/Entity/ContentEntityInterface.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityInterface.php
@@ -25,9 +25,6 @@
   /**
    * Determines if the current translation of the entity has unsaved changes.
    *
-   * If the entity is translatable only translatable fields will be checked for
-   * changes.
-   *
    * @return bool
    *   TRUE if the current translation of the entity has changes.
    */
diff --git a/core/modules/system/tests/modules/entity_test/src/Entity/EntityTestMulChanged.php b/core/modules/system/tests/modules/entity_test/src/Entity/EntityTestMulChanged.php
index 5fbc408..dd3da09 100644
--- a/core/modules/system/tests/modules/entity_test/src/Entity/EntityTestMulChanged.php
+++ b/core/modules/system/tests/modules/entity_test/src/Entity/EntityTestMulChanged.php
@@ -60,6 +60,10 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setDescription(t('The time that the entity was last edited.'))
       ->setTranslatable(TRUE);
 
+    $fields['not_translatable'] = BaseFieldDefinition::create('string')
+      ->setLabel(t('Non translatable'))
+      ->setDescription(t('A non-translatable string field'));
+
     return $fields;
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityChangedTest.php b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityChangedTest.php
index e8425e5..beebf47 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityChangedTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityChangedTest.php
@@ -61,6 +61,7 @@ public function testChanged() {
     // Create a test entity.
     $entity = EntityTestMulChanged::create(array(
       'name' => $this->randomString(),
+      'not_translatable' => $this->randomString(),
       'user_id' => $user1->id(),
       'language' => 'en',
     ));
@@ -122,6 +123,23 @@ public function testChanged() {
       'Changed time of the German translation did not change.'
     );
 
+    // Update a non-translatable field to make sure that the changed timestamp
+    // is updated for all translations.
+    $entity->set('not_translatable', $this->randomString())->save();
+
+    $this->assertTrue(
+      $entity->getChangedTime() > $changed_en,
+      'Changed time of original language did change.'
+    );
+
+    $this->assertTrue(
+      $german->getChangedTime() > $changed_de,
+      'Changed time of the German translation did change.'
+    );
+
+    $changed_en = $entity->getChangedTime();
+    $changed_de = $german->getChangedTime();
+
     $entity->setOwner($user2);
 
     $entity->save();