diff --git a/roles/itop/templates/itop.service.j2 b/roles/itop/templates/itop.service.j2
index f8c8ed1..54427c7 100644
--- a/roles/itop/templates/itop.service.j2
+++ b/roles/itop/templates/itop.service.j2
@@ -4,6 +4,7 @@ Description=iTop {{ itop_id }} background tasks
 [Service]
 Type=oneshot
 ExecStart=/bin/php{{ itop_php_version }} \
+            -d memory_limit=512M \
             -d session.save_path={{ itop_root_dir }}/sessions \
             {{ itop_root_dir }}/web/webservices/cron.php \
             --param_file={{ itop_root_dir }}/etc/cron.params \