diff --git a/nova/api/openstack/create_instance_helper.py b/nova/api/openstack/create_instance_helper.py
index 7e9d48c023d5..c8798536e687 100644
--- a/nova/api/openstack/create_instance_helper.py
+++ b/nova/api/openstack/create_instance_helper.py
@@ -164,7 +164,7 @@ class CreateInstanceHelper(object):
                                   reservation_id=reservation_id,
                                   min_count=min_count,
                                   max_count=max_count,
-                                  user_data=user_data))
+                                  user_data=user_data,
                                   availability_zone=availability_zone))
         except quota.QuotaError as error:
             self._handle_quota_error(error)