diff -up install/install.php.rpm install/install.php
--- install/install.php.rpm	2014-12-17 13:36:22.420558338 +0100
+++ install/install.php	2014-12-17 13:38:45.278209044 +0100
@@ -383,6 +383,10 @@ function step4 ($databasename, $newdatab
       $query = "UPDATE `glpi_users`
                 SET `language` = NULL";
       $DB->queryOrDie($query, "4203");
+
+      // RPM provides a good system cron
+      $query = "UPDATE `glpi_crontasks` SET `mode`=2 WHERE `name`!='watcher' AND (`allowmode` & 2)";
+      $DB->queryOrDie($query, "4203");
    }
 
    //Check if the port is in url
diff -up install/update.php.rpm install/update.php
--- install/update.php.rpm	2014-12-11 14:16:55.000000000 +0100
+++ install/update.php	2014-12-17 13:36:22.420558338 +0100
@@ -830,6 +830,10 @@ function updateDbUpTo031() {
    $plugin = new Plugin();
    $plugin->unactivateAll();
 
+   // RPM provides a good system cron
+   $query = "UPDATE `glpi_crontasks` SET `mode`=2 WHERE `name`!='watcher' AND (`allowmode` & 2)";
+   $DB->queryOrDie($query);
+
    DBmysql::optimize_tables($migration);
 
    return $ret;