diff --git a/roles/ipabackup/vars/Ubuntu-18.04.yml b/roles/ipabackup/vars/Ubuntu-18.04.yml
index 3dddac75..325d86a5 100644
--- a/roles/ipabackup/vars/Ubuntu-18.04.yml
+++ b/roles/ipabackup/vars/Ubuntu-18.04.yml
@@ -1,4 +1,5 @@
 # vars/Ubuntu.yml
+---
 ipaserver_packages: [ "freeipa-server" ]
 ipaserver_packages_dns: [ "freeipa-server-dns" ]
 ipaserver_packages_adtrust: [ "freeipa-server-trust-ad" ]
diff --git a/roles/ipaclient/vars/Ubuntu-18.04.yml b/roles/ipaclient/vars/Ubuntu-18.04.yml
index 26c6fbbf..e01f5021 100644
--- a/roles/ipaclient/vars/Ubuntu-18.04.yml
+++ b/roles/ipaclient/vars/Ubuntu-18.04.yml
@@ -1,4 +1,5 @@
 # vars/Ubuntu-18.04.yml
+---
 ipaclient_packages: [ "freeipa-client" ]
 # Ubuntu Bionic Beaver must use python2 as Python interpreter due
 # to the way python-ipalib package is defined.
diff --git a/roles/ipareplica/vars/Ubuntu-18.04.yml b/roles/ipareplica/vars/Ubuntu-18.04.yml
index c21bfcd1..b729f362 100644
--- a/roles/ipareplica/vars/Ubuntu-18.04.yml
+++ b/roles/ipareplica/vars/Ubuntu-18.04.yml
@@ -1,4 +1,5 @@
 # vars/Ubuntu.yml
+---
 ipareplica_packages: [ "freeipa-server" ]
 ipareplica_packages_dns: [ "freeipa-server-dns" ]
 ipareplica_packages_adtrust: [ "freeipa-server-trust-ad" ]
diff --git a/roles/ipaserver/vars/Ubuntu-18.04.yml b/roles/ipaserver/vars/Ubuntu-18.04.yml
index 3dddac75..325d86a5 100644
--- a/roles/ipaserver/vars/Ubuntu-18.04.yml
+++ b/roles/ipaserver/vars/Ubuntu-18.04.yml
@@ -1,4 +1,5 @@
 # vars/Ubuntu.yml
+---
 ipaserver_packages: [ "freeipa-server" ]
 ipaserver_packages_dns: [ "freeipa-server-dns" ]
 ipaserver_packages_adtrust: [ "freeipa-server-trust-ad" ]