diff --git a/tests/roles/bootstrap-host/vars/redhat.yml b/tests/roles/bootstrap-host/vars/redhat.yml
index a9b5fdce23..0006ee56e7 100644
--- a/tests/roles/bootstrap-host/vars/redhat.yml
+++ b/tests/roles/bootstrap-host/vars/redhat.yml
@@ -31,7 +31,7 @@ packages_install:
 
 packages_remove: []
 
-swap_create_command: "dd if=/dev/zero of=/openstack/swap.img bs=1M count={{ bootstrap_host_swap_size*1024 }}"
+swap_create_command: "dd if=/dev/zero of=/openstack/swap.img bs=1M count={{ (bootstrap_host_swap_size | int) * 1024 }}"
 rc_local: /etc/rc.d/rc.local
 rc_local_insert_before: "^touch /var/lock/subsys/local$"