diff --git a/src/Bundle/ChillMainBundle/Tests/Serializer/Normalizer/DateNormalizerTest.php b/src/Bundle/ChillMainBundle/Tests/Serializer/Normalizer/DateNormalizerTest.php
index f7ef7e986..6de3a2e8d 100644
--- a/src/Bundle/ChillMainBundle/Tests/Serializer/Normalizer/DateNormalizerTest.php
+++ b/src/Bundle/ChillMainBundle/Tests/Serializer/Normalizer/DateNormalizerTest.php
@@ -41,7 +41,7 @@ final class DateNormalizerTest extends KernelTestCase
         $date = DateTime::createFromFormat('Y-m-d H:i:sO', '2021-06-05 00:00:00+02:00');
 
         yield [
-            ['datetime' => '2021-06-05T15:05:01+0200'],
+            ['datetime' => '2021-06-05T15:05:01+0200', 'datetime8601' => '2021-06-05T15:05:01+02:00'],
             $datetime, 'json', null, 'simple normalization to json',
         ];