diff --git a/core/lib/Drupal/Core/Authentication/AuthenticationManager.php b/core/lib/Drupal/Core/Authentication/AuthenticationManager.php
index 4496193..a193933 100644
--- a/core/lib/Drupal/Core/Authentication/AuthenticationManager.php
+++ b/core/lib/Drupal/Core/Authentication/AuthenticationManager.php
@@ -59,16 +59,16 @@ class AuthenticationManager implements AuthenticationProviderInterface, Authenti
    *
    * @param \Drupal\Core\Authentication\AuthenticationProviderInterface $provider
    *   The provider object.
-   * @param string $provider_id
+   * @param string $id
    *   Identifier of the provider.
    * @param int $priority
    *   The providers priority.
    */
-  public function addProvider(AuthenticationProviderInterface $provider, $provider_id, $priority = 0) {
-    $provider_id = substr($provider_id, strlen('authentication.'));
+  public function addProvider(AuthenticationProviderInterface $provider, $id, $priority = 0) {
+    $id = substr($id, strlen('authentication.'));
 
-    $this->providers[$provider_id] = $provider;
-    $this->providerOrders[$priority][$provider_id] = $provider;
+    $this->providers[$id] = $provider;
+    $this->providerOrders[$priority][$id] = $provider;
     // Force the builders to be re-sorted.
     $this->sortedProviders = NULL;
   }