diff --git a/core/modules/path/lib/Drupal/path/Form/EditForm.php b/core/modules/path/lib/Drupal/path/Form/EditForm.php
index ef19532..ef43907 100644
--- a/core/modules/path/lib/Drupal/path/Form/EditForm.php
+++ b/core/modules/path/lib/Drupal/path/Form/EditForm.php
@@ -173,10 +173,11 @@ public function validateForm(array &$form, array &$form_state) {
 
     $alias_exists = $this->aliasManager->checkAliasExists($pid, $alias, $langcode);
     if ($alias_exists) {
-      form_set_error('alias', $this->t('The alias %alias is already in use in this language.', array('%alias' => $alias)));
+
+      $this->setFormError('alias', $form_state, $this->t('The alias %alias is already in use in this language.', array('%alias' => $alias)));
     }
     if (!drupal_valid_path($source)) {
-      form_set_error('source', $this->t("The path '@link_path' is either invalid or you do not have access to it.", array('@link_path' => $source)));
+      $this->setFormError('source', $form_state, $this->t("The path '@link_path' is either invalid or you do not have access to it.", array('@link_path' => $source)));
     }
   }