diff -u b/core/lib/Drupal/Core/Field/FieldItemList.php b/core/lib/Drupal/Core/Field/FieldItemList.php
--- b/core/lib/Drupal/Core/Field/FieldItemList.php
+++ b/core/lib/Drupal/Core/Field/FieldItemList.php
@@ -304,7 +304,7 @@
       // hook_field_attach_display_alter() needs to receive the 'prepared'
       // $display_options, so we cannot let preparation happen internally.
       $formatter_manager = \Drupal::service('plugin.manager.field.formatter');
-      $display_options = $formatter_manager->prepareConfiguration($field_definition->getFieldType(), $display_options);
+      $display_options = $formatter_manager->prepareConfiguration($field_definition->getType(), $display_options);
       $formatter = $formatter_manager->getInstance(array(
         'field_definition' => $field_definition,
         'view_mode' => $view_mode,