diff --git a/core/modules/options/src/Tests/OptionsFieldUnitTestBase.php b/core/modules/options/src/Tests/OptionsFieldUnitTestBase.php
index fcfe4f8..b2b97d7 100644
--- a/core/modules/options/src/Tests/OptionsFieldUnitTestBase.php
+++ b/core/modules/options/src/Tests/OptionsFieldUnitTestBase.php
@@ -72,6 +72,7 @@ protected function setUp() {
     $this->field = entity_create('field_config', array(
       'field_storage' => $this->fieldStorage,
       'bundle' => 'entity_test',
+      'required' => TRUE,
     ));
     $this->field->save();