diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/FieldInstanceDefaults.php b/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/FieldInstanceDefaults.php
index 6cf36a4..50e6679 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/FieldInstanceDefaults.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/FieldInstanceDefaults.php
@@ -57,6 +57,7 @@ public function transform($value, MigrateExecutable $migrate_executable, Row $ro
         if (!empty($widget_settings['default_value'][0]['url'])) {
           $default['title'] = $widget_settings['default_value'][0]['title'];
           $default['url'] = $widget_settings['default_value'][0]['url'];
+          $default['options'] = ['attributes' => []];
         }
         break;
     }
diff --git a/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php
index 31f206d..3649ac0 100644
--- a/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php
+++ b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php
@@ -144,6 +144,7 @@ public function testFieldInstanceSettings() {
     $this->assertEqual($field->getSettings(), $expected);
     $this->assertEqual('default link title', $entity->field_test_link->title, 'Field field_test_link default title is correct.');
     $this->assertEqual('http://drupal.org', $entity->field_test_link->url, 'Field field_test_link default title is correct.');
+    $this->assertIdentical($entity->field_test_link->options['attributes'], []);
   }
 
   /**