diff --git a/nova/api/openstack/compute/rest_api_version_history.rst b/nova/api/openstack/compute/rest_api_version_history.rst
index 4bdc30c1f76a..de216ef29d4b 100644
--- a/nova/api/openstack/compute/rest_api_version_history.rst
+++ b/nova/api/openstack/compute/rest_api_version_history.rst
@@ -996,5 +996,6 @@ through ``GET /servers/{server_id}/os-instance-actions`` and
 
 2.77
 ----
+
 API microversion 2.77 adds support for specifying availability zone when
 unshelving a shelved offloaded server.
diff --git a/nova/api/openstack/compute/shelve.py b/nova/api/openstack/compute/shelve.py
index 3293e07fa0a9..b08a4ac7e9ba 100644
--- a/nova/api/openstack/compute/shelve.py
+++ b/nova/api/openstack/compute/shelve.py
@@ -87,10 +87,9 @@ class ShelveController(wsgi.Controller):
 
         new_az = None
         unshelve_dict = body['unshelve']
-        if unshelve_dict and 'availability_zone' in unshelve_dict:
-            support_az = api_version_request.is_supported(req, '2.77')
-            if support_az:
-                new_az = unshelve_dict['availability_zone']
+        support_az = api_version_request.is_supported(req, '2.77')
+        if support_az and unshelve_dict:
+            new_az = unshelve_dict['availability_zone']
 
         # We could potentially move this check to conductor and avoid the
         # extra API call to neutron when we support move operations with ports