diff --git a/cinder_tempest_plugin/config.py b/cinder_tempest_plugin/config.py
index e15a399..9cc3573 100644
--- a/cinder_tempest_plugin/config.py
+++ b/cinder_tempest_plugin/config.py
@@ -23,3 +23,15 @@
                 default=False,
                 help='Enable to run Cinder volume revert tests'),
 ]
+
+# The barbican service is discovered by config_tempest [1], and will appear
+# in the [service_available] group in tempest.conf. However, the 'barbican'
+# option isn't registered by tempest itself, and so we do it here. This adds
+# the ability to test CONF.service_available.barbican.
+#
+# [1] I96800a95f844ce7675d266e456e01620e63e347a
+service_available_option = [
+    cfg.BoolOpt('barbican',
+                default=False,
+                help="Whether or not barbican is expected to be available"),
+]