diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceFieldFormatter.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceFieldFormatter.php
index defc70a..43d2e0d 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceFieldFormatter.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceFieldFormatter.php
@@ -298,7 +298,7 @@ public function settingsForm(array $form, FormStateInterface $form_state) {
     if ($selected_field_name) {
       $field_storage = $field_storage_definitions[$selected_field_name];
       $formatter_options = $this->getAvailableFormatterOptions($field_storage);
-      $formatter_type = $this->getFormatterType($selected_field_name, $form_state);
+      $formatter_type = $this->getFormatterType($selected_field_name, $form_state)['machine_name'];
       $settings = $this->getSetting('settings', $form_state) ?: [];
 
       $form['type'] = [