diff --git a/core/lib/Drupal/Core/Session/SessionManager.php b/core/lib/Drupal/Core/Session/SessionManager.php
index 607103109d..252b01d5f9 100644
--- a/core/lib/Drupal/Core/Session/SessionManager.php
+++ b/core/lib/Drupal/Core/Session/SessionManager.php
@@ -218,8 +218,8 @@ public function regenerate($destroy = FALSE, $lifetime = NULL) {
 
     if ($this->isStarted()) {
       $old_session_id = $this->getId();
+      session_regenerate_id($destroy);
     }
-    session_id(Crypt::randomBytesBase64());
 
     $this->getMetadataBag()->clearCsrfTokenSeed();