diff --git a/core/includes/form.inc b/core/includes/form.inc
index cc6e8e8ea967b9a60e5fce6ec687df8238f354ee..52f2a1ed70f74754ac64499492d37ba14f65c970 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -30,16 +30,6 @@ function drupal_form_submit($form_arg, FormStateInterface $form_state) {
   \Drupal::formBuilder()->submitForm($form_arg, $form_state);
 }
 
-/**
- * Removes internal Form API elements and buttons from submitted form values.
- *
- * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.0.
- *   Use $form_state->cleanValues().
- */
-function form_state_values_clean(FormStateInterface $form_state) {
-  $form_state->cleanValues();
-}
-
 /**
  * Prepares variables for select element templates.
  *