diff --git a/core/modules/aggregator/aggregator.module b/core/modules/aggregator/aggregator.module
index d6c303f..c0ff91e 100644
--- a/core/modules/aggregator/aggregator.module
+++ b/core/modules/aggregator/aggregator.module
@@ -107,23 +107,6 @@ function aggregator_entity_extra_field_info() {
   $extra = array();
 
   $extra['aggregator_feed']['aggregator_feed'] = array(
-    'form' => array(
-      'title' => array(
-        'label' => t('Title'),
-        'description' => t('Title'),
-        'weight' => -1,
-      ),
-      'url' => array(
-        'label' => t('URL'),
-        'description' => t('URL'),
-        'weight' => 0,
-      ),
-      'refresh' => array(
-        'label' => t('Update interval'),
-        'description' => t('Update interval'),
-        'weight' => 0,
-      ),
-    ),
     'display' => array(
       'items' => array(
         'label' => t('Items'),
diff --git a/core/modules/aggregator/lib/Drupal/aggregator/Entity/Feed.php b/core/modules/aggregator/lib/Drupal/aggregator/Entity/Feed.php
index 92533d2..d40ec0a 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/Entity/Feed.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Entity/Feed.php
@@ -144,7 +144,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setDisplayOptions('form', array(
         'type' => 'string',
         'weight' => -5,
-      ));
+      ))
+      ->setDisplayConfigurable('form', TRUE);
 
     $fields['langcode'] = FieldDefinition::create('language')
       ->setLabel(t('Language code'))
@@ -158,7 +159,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setDisplayOptions('form', array(
         'type' => 'uri',
         'weight' => -3,
-      ));
+      ))
+      ->setDisplayConfigurable('form', TRUE);
 
     $intervals = array(900, 1800, 3600, 7200, 10800, 21600, 32400, 43200, 64800, 86400, 172800, 259200, 604800, 1209600, 2419200);
     $period = array_map('format_interval', array_combine($intervals, $intervals));
@@ -173,7 +175,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setDisplayOptions('form', array(
         'type' => 'options_select',
         'weight' => -2,
-      ));
+      ))
+      ->setDisplayConfigurable('form', TRUE);
 
     $fields['checked'] = FieldDefinition::create('timestamp')
       ->setLabel(t('Checked'))