diff --git a/core/modules/system/tests/modules/entity_test/src/Entity/EntityTest.php b/core/modules/system/tests/modules/entity_test/src/Entity/EntityTest.php
index ace4815..982e44d 100644
--- a/core/modules/system/tests/modules/entity_test/src/Entity/EntityTest.php
+++ b/core/modules/system/tests/modules/entity_test/src/Entity/EntityTest.php
@@ -107,7 +107,7 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setSetting('handler', 'default')
       // Default EntityTest entities to have the root user as the owner, to
       // simplify testing.
-      ->setDefaultValue(1)
+      ->setDefaultValue(array(0 => array('target_id' => 1)))
       ->setTranslatable(TRUE)
       ->setDisplayOptions('form', array(
         'type' => 'entity_reference_autocomplete',