diff --git a/contrib/terraform/openstack/ansible_bastion_template.txt b/contrib/terraform/openstack/ansible_bastion_template.txt
index cdf0120668a54795d850369882e8d85705bd842d..a304b2c9d5dc1703df6e09990ab9b9ebe98762d7 100644
--- a/contrib/terraform/openstack/ansible_bastion_template.txt
+++ b/contrib/terraform/openstack/ansible_bastion_template.txt
@@ -1 +1 @@
-ansible_ssh_common_args: '-o ProxyCommand="ssh -o StrictHostKeyChecking=no -W %h:%p -q USER@BASTION_ADDRESS"' 
+ansible_ssh_common_args: "-o ProxyCommand='ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -W %h:%p -q USER@BASTION_ADDRESS {% if ansible_ssh_private_key_file is defined %}-i {{ ansible_ssh_private_key_file }}{% endif %}'"