diff --git a/core/modules/user/user.module b/core/modules/user/user.module
index c7bf96a..b0bc699 100644
--- a/core/modules/user/user.module
+++ b/core/modules/user/user.module
@@ -617,7 +617,7 @@ function user_login_finalize(UserInterface $account) {
 /**
  * Implements hook_user_login().
  */
-function user_user_login(AccountInterface $account) {
+function user_user_login($account) {
   // Reset static cache of default variables in template_preprocess() to reflect
   // the new user.
   drupal_static_reset('template_preprocess');
@@ -626,7 +626,7 @@ function user_user_login(AccountInterface $account) {
 /**
  * Implements hook_user_logout().
  */
-function user_user_logout(AccountInterface $account) {
+function user_user_logout($account) {
   // Reset static cache of default variables in template_preprocess() to reflect
   // the new user.
   drupal_static_reset('template_preprocess');
@@ -649,7 +649,7 @@ function user_user_logout(AccountInterface $account) {
  *   A unique URL that provides a one-time log in for the user, from which
  *   they can change their password.
  */
-function user_pass_reset_url(UserInterface $account, $options = array()) {
+function user_pass_reset_url($account, $options = array()) {
   $timestamp = REQUEST_TIME;
   $langcode = isset($options['langcode']) ? $options['langcode'] : $account->getPreferredLangcode();
   return \Drupal::url('user.reset',
@@ -686,7 +686,7 @@ function user_pass_reset_url(UserInterface $account, $options = array()) {
  * @see user_mail_tokens()
  * @see \Drupal\user\Controller\UserController::confirmCancel()
  */
-function user_cancel_url(UserInterface $account, $options = array()) {
+function user_cancel_url($account, $options = array()) {
   $timestamp = REQUEST_TIME;
   $langcode = isset($options['langcode']) ? $options['langcode'] : $account->getPreferredLangcode();
   $url_options = array('absolute' => TRUE, 'language' => \Drupal::languageManager()->getLanguage($langcode));
@@ -953,7 +953,7 @@ function user_delete_multiple(array $uids) {
  * @return array
  *   An array as expected by drupal_render().
  */
-function user_view(UserInterface $account, $view_mode = 'full', $langcode = NULL) {
+function user_view($account, $view_mode = 'full', $langcode = NULL) {
   return entity_view($account, $view_mode, $langcode);
 }
 
@@ -971,7 +971,7 @@ function user_view(UserInterface $account, $view_mode = 'full', $langcode = NULL
  * @return array
  *   An array in the format expected by drupal_render().
  */
-function user_view_multiple(array $accounts, $view_mode = 'full', $langcode = NULL) {
+function user_view_multiple($accounts, $view_mode = 'full', $langcode = NULL) {
   return entity_view_multiple($accounts, $view_mode, $langcode);
 }
 
@@ -1019,7 +1019,7 @@ function user_mail($key, &$message, $params) {
  *   A keyed array of settings and flags to control the token replacement
  *   process. See \Drupal\Core\Utility\Token::replace().
  */
-function user_mail_tokens(array &$replacements, array $data, array $options) {
+function user_mail_tokens(&$replacements, $data, $options) {
   if (isset($data['user'])) {
     $replacements['[user:one-time-login-url]'] = user_pass_reset_url($data['user'], $options);
     $replacements['[user:cancel-url]'] = user_cancel_url($data['user'], $options);
@@ -1279,7 +1279,7 @@ function user_role_revoke_permissions($rid, array $permissions = array()) {
  *
  * @see user_mail_tokens()
  */
-function _user_mail_notify($op, AccountInterface $account, $langcode = NULL) {
+function _user_mail_notify($op, $account, $langcode = NULL) {
   // By default, we always notify except for canceled and blocked.
   $notify = \Drupal::config('user.settings')->get('notify.' . $op);
   if ($notify || ($op != 'status_canceled' && $op != 'status_blocked')) {