Index: modules/system/system.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.module,v
retrieving revision 1.881
diff -u -p -r1.881 system.module
--- modules/system/system.module	30 Jan 2010 07:54:01 -0000	1.881
+++ modules/system/system.module	1 Feb 2010 05:39:56 -0000
@@ -2715,7 +2715,7 @@ function system_cron() {
     }
   }
 
-  $core = array('cache', 'cache_filter', 'cache_page', 'cache_form', 'cache_menu');
+  $core = array('cache', 'cache_filter', 'cache_page', 'cache_form');
   $cache_tables = array_merge(module_invoke_all('flush_caches'), $core);
   foreach ($cache_tables as $table) {
     cache_clear_all(NULL, $table);