diff --git a/core/modules/field/lib/Drupal/field/Plugin/Type/Widget/WidgetPluginManager.php b/core/modules/field/lib/Drupal/field/Plugin/Type/Widget/WidgetPluginManager.php
index c614133..8da87ef 100644
--- a/core/modules/field/lib/Drupal/field/Plugin/Type/Widget/WidgetPluginManager.php
+++ b/core/modules/field/lib/Drupal/field/Plugin/Type/Widget/WidgetPluginManager.php
@@ -235,7 +235,7 @@ public function baseFieldForm(FieldItemListInterface $field, array &$form, array
   /**
    * @todo Document.
    */
-  public function baseFieldExtractFormValues(FieldItemListInterfaceInterface $field, array &$form, array &$form_state) {
+  public function baseFieldExtractFormValues(FieldItemListInterface $field, array &$form, array &$form_state) {
     $options = array(
       'field_definition' => $field->getFieldDefinition(),
       'form_mode' => 'default',