diff --git a/core/modules/field/tests/field.test b/core/modules/field/tests/field.test
index 667bac1..0497a22 100644
--- a/core/modules/field/tests/field.test
+++ b/core/modules/field/tests/field.test
@@ -440,7 +440,7 @@ class FieldAttachStorageTestCase extends FieldAttachTestCase {
    */
   function testFieldAttachSaveMissingDataDefaultValue() {
     // Add a default value function.
-    $this->instance['default_value_function'] = 'field_test_default_value';
+    $this->instance['settings']['default_value_function'] = 'field_test_default_value';
     field_update_instance($this->instance);
 
     $entity_type = 'test_entity';