diff --git a/includes/common.inc b/includes/common.inc
index f6171cf..ac8db9c 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -5224,8 +5224,6 @@ function drupal_cron_run() {
     foreach ($queues as $queue_name => $info) {
       DrupalQueue::get($queue_name)->createQueue();
     }
-    // Register shutdown callback.
-    drupal_register_shutdown_function('drupal_cron_cleanup');
 
     // Iterate through the modules calling their cron handlers (if any):
     foreach (module_implements('cron') as $module) {