diff --git a/playbook.yml b/playbook.yml
index 09ae343..256078b 100644
--- a/playbook.yml
+++ b/playbook.yml
@@ -27,8 +27,8 @@
         guestinfo.rootpw: "{{ root_password }}"
         guestinfo.rootsshkey: "foo"
         guestinfo.ntpserver: 127.0.0.1
-        guestinfo.ipaddress: "{{ item.ip | ansible.utils.ipaddr('address')
-        guestinfo.prefixlength: ""
+        guestinfo.ipaddress: "{{ item.ip | ansible.utils.ipaddr('address') }}"
+        guestinfo.prefixlength: "{{ (item.ip | split('/'))[-1] }}"
         guestinfo.dnsserver: 127.0.0.1
         guestinfo.gateway: 127.0.0.1
       # customization_spec: "{{ customization_spec }}"