diff --git a/core/modules/hal/lib/Drupal/hal/Tests/DenormalizeTest.php b/core/modules/hal/lib/Drupal/hal/Tests/DenormalizeTest.php
index 910c14f..e1d7a30 100644
--- a/core/modules/hal/lib/Drupal/hal/Tests/DenormalizeTest.php
+++ b/core/modules/hal/lib/Drupal/hal/Tests/DenormalizeTest.php
@@ -206,7 +206,10 @@ public function testPatchDenormailzation() {
     // Assert that all fields are NULL and not set to default values. Example:
     // the UUID field is NULL and not initialized as usual.
     foreach ($denormalized as $field_name => $field) {
-      $this->assertFalse(isset($denormalized->$field_name), "$field_name is not set.");
+      // The 'langcode' field has always a value.
+      if ($field_name != 'langcode') {
+        $this->assertFalse(isset($denormalized->$field_name), "$field_name is not set.");
+      }
     }
   }
 }