diff --git a/roles/batcave/files/ansible-playbook-check-diff.cron b/roles/batcave/files/ansible-playbook-check-diff.cron
index eeec65f31d..d361dbc9aa 100755
--- a/roles/batcave/files/ansible-playbook-check-diff.cron
+++ b/roles/batcave/files/ansible-playbook-check-diff.cron
@@ -4,6 +4,7 @@ source /root/sshagent >>/dev/null
 export ANSIBLE_HOST_KEY_CHECKING=False
 export HOME=/root/
 #export ANSIBLE_SSH_PIPELINING=False
+export ANSIBLE_HASH_BEHAVIOUR=merge
 /srv/web/infra/ansible/scripts/ansible-playbook-check-diff |& grep ok=
 
 # Send a email with failed or changed from the above check/diff run