diff --git a/core/modules/datetime/src/Tests/DateTestBase.php b/core/modules/datetime/src/Tests/DateTestBase.php
index ed8d9b4169..c9a9722d0c 100644
--- a/core/modules/datetime/src/Tests/DateTestBase.php
+++ b/core/modules/datetime/src/Tests/DateTestBase.php
@@ -114,7 +114,7 @@ protected function createField() {
       'field_name' => $field_name,
       'entity_type' => 'entity_test',
       'type' => $type,
-      'settings' => ['datetime_type' => DateRangeItem::DATETIME_TYPE_DATE],
+      'settings' => ['datetime_type' => 'aardvark'],
     ]);
     $this->fieldStorage->save();
     $this->field = FieldConfig::create([