diff --git a/core/modules/automated_cron/src/EventSubscriber/AutomatedCron.php b/core/modules/automated_cron/src/EventSubscriber/AutomatedCron.php
index 6eed009..de5e365 100644
--- a/core/modules/automated_cron/src/EventSubscriber/AutomatedCron.php
+++ b/core/modules/automated_cron/src/EventSubscriber/AutomatedCron.php
@@ -82,21 +82,34 @@ public function onTerminate(PostResponseEvent $event) {
           // \GuzzleHttp\Promise\PromiseInterface object, which can be either
           // fulfilled or rejected.
           $url = Url::fromRoute('system.cron', ['key' => $this->state->get('system.cron_key')], ['absolute' => TRUE])->toString();
-          $promise = $this->httpClient->requestAsync('GET', $url);
-
-          // Since the lock is persistent between requests, we have to release
-          // it no matter if the promise is fulfilled (cron succeeded) or
-          // rejected (cron failed), otherwise we will never be able to acquire
-          // it again in the future.
-          $promise->then(
-            function () { $this->lock->release('cron_request'); },
-            function () { $this->lock->release('cron_request'); }
-          );
+
+          try {
+            $this->doAsyncRequset($url);
+          }
+          catch (\Exception $e) {
+            watchdog_exception('automated_cron', $e);
+          }
+          finally {
+            $this->lock->release('cron_request');
+          }
         }
       }
     }
   }
 
+  protected function doAsyncRequset($url) {
+    $parts = parse_url($url);
+
+    $fp = fsockopen($parts['host'], isset($parts['port']) ? $parts['port'] : 80, $errno, $errstr, 30);
+
+    $out = 'POST ' . $parts['path'] . " HTTP/1.1\r\n";
+    $out .= 'Host: ' . $parts['host'] . "\r\n";
+    $out .= "Connection: Close\r\n\r\n";
+
+    fwrite($fp, $out);
+    fclose($fp);
+  }
+
   /**
    * Registers the methods in this class that should be listeners.
    *