diff --git a/samba-dc.yml b/samba-dc.yml
index 9edb768..9d8b3e3 100644
--- a/samba-dc.yml
+++ b/samba-dc.yml
@@ -1,4 +1,5 @@
 - hosts: samba-dc
+  serial: 1
   roles:
   - kerberos
   - samba-dc