diff --git a/zaza/openstack/charm_tests/rabbitmq_server/utils.py b/zaza/openstack/charm_tests/rabbitmq_server/utils.py
index 3994178..d00f288 100644
--- a/zaza/openstack/charm_tests/rabbitmq_server/utils.py
+++ b/zaza/openstack/charm_tests/rabbitmq_server/utils.py
@@ -354,9 +354,15 @@ def is_ssl_enabled_on_unit(unit, port=None):
     host = unit.public_address
     unit_name = unit.entity_id
 
-    conf_file = '/etc/rabbitmq/rabbitmq.config'
+    conf_file = '/etc/rabbitmq/rabbitmq.conf'
     conf_contents = str(generic_utils.get_file_contents(unit,
                                                         conf_file))
+    # Fallback to old style configuration file for
+    # older RMQ releases if .conf is empty/not found
+    if not conf_contents:
+        conf_file = '/etc/rabbitmq/rabbitmq.config'
+        conf_contents = str(generic_utils.get_file_contents(unit,
+                                                            conf_file))
     # Checks
     conf_ssl = 'ssl' in conf_contents
     conf_port = str(port) in conf_contents