diff --git a/core/modules/entity_reference/entity_reference.module b/core/modules/entity_reference/entity_reference.module
index af7b5fc..9472ebb 100644
--- a/core/modules/entity_reference/entity_reference.module
+++ b/core/modules/entity_reference/entity_reference.module
@@ -66,34 +66,6 @@ function entity_reference_get_selection_handler(FieldDefinitionInterface $field_
 }
 
 /**
- * Implements hook_field_settings_form().
- */
-function entity_reference_field_settings_form($field, $instance) {
-  // Select the target entity type.
-  $entity_type_options = array();
-  foreach (entity_get_info() as $entity_type => $entity_info) {
-    // @todo As the database schema can currently only store numeric IDs of
-    // referenced entities and configuration entities have string IDs, prevent
-    // configuration entities from being referenced.
-    if (!is_subclass_of($entity_info['class'], '\Drupal\Core\Config\Entity\ConfigEntityInterface')) {
-      $entity_type_options[$entity_type] = $entity_info['label'];
-    }
-  }
-
-  $form['target_type'] = array(
-    '#type' => 'select',
-    '#title' => t('Type of item to reference'),
-    '#options' => $entity_type_options,
-    '#default_value' => $field['settings']['target_type'],
-    '#required' => TRUE,
-    '#disabled' => $field->hasData(),
-    '#size' => 1,
-  );
-
-  return $form;
-}
-
-/**
  * Implements hook_ENTITY_TYPE_update() for 'field_entity'.
  *
  * Reset the instance handler settings, when the target type is changed.
diff --git a/core/modules/entity_reference/lib/Drupal/entity_reference/Plugin/field/field_type/ConfigurableEntityReferenceItem.php b/core/modules/entity_reference/lib/Drupal/entity_reference/Plugin/field/field_type/ConfigurableEntityReferenceItem.php
index 956a968..fc3d4f7 100644
--- a/core/modules/entity_reference/lib/Drupal/entity_reference/Plugin/field/field_type/ConfigurableEntityReferenceItem.php
+++ b/core/modules/entity_reference/lib/Drupal/entity_reference/Plugin/field/field_type/ConfigurableEntityReferenceItem.php
@@ -115,4 +115,34 @@ public function getConstraints() {
     return $constraints;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsForm(array $form, array &$form_state) {
+    $field = $this->getInstance()->getField();
+
+    // Select the target entity type.
+    $entity_type_options = array();
+    foreach (entity_get_info() as $entity_type => $entity_info) {
+      // @todo As the database schema can currently only store numeric IDs of
+      // referenced entities and configuration entities have string IDs, prevent
+      // configuration entities from being referenced.
+      if (!is_subclass_of($entity_info['class'], '\Drupal\Core\Config\Entity\ConfigEntityInterface')) {
+        $entity_type_options[$entity_type] = $entity_info['label'];
+      }
+    }
+
+    $element['target_type'] = array(
+      '#type' => 'select',
+      '#title' => t('Type of item to reference'),
+      '#options' => $entity_type_options,
+      '#default_value' => $field->settings['target_type'],
+      '#required' => TRUE,
+      '#disabled' => $field->hasData(),
+      '#size' => 1,
+    );
+
+    return $element;
+  }
+
 }