diff --git a/core/modules/options/tests/options_test/options_test.module b/core/modules/options/tests/options_test/options_test.module
index fe4861a..3356a21 100644
--- a/core/modules/options/tests/options_test/options_test.module
+++ b/core/modules/options/tests/options_test/options_test.module
@@ -14,7 +14,7 @@
  *
  * @see options_allowed_values().
  */
-function options_test_allowed_values_callback(FieldStorageDefinitionInterface $definition, FieldableEntityInterface $entity) {
+function options_test_allowed_values_callback(FieldStorageDefinitionInterface $definition, FieldableEntityInterface $entity = NULL) {
   $values = array(
     'Group 1' => array(
       0 => 'Zero',