diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index 987137b552670fbe3948e4dd485342a59cb6871f..f26bb07b93b9255e19654c4b66430b47757753d0 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -1120,6 +1120,7 @@ function system_menu() {
  * @see system_cron_access().
  */
 function system_cron_page() {
+  drupal_page_is_cacheable(FALSE);
   drupal_cron_run();
 
   // Returning nothing causes no output to be generated.