diff --git a/tempest/api/compute/base.py b/tempest/api/compute/base.py
index a5d5c57..83fabdb 100644
--- a/tempest/api/compute/base.py
+++ b/tempest/api/compute/base.py
@@ -377,10 +377,12 @@
         cls.servers_client.confirm_resize_server(server_id)
         waiters.wait_for_server_status(cls.servers_client, server_id, 'ACTIVE')
         server = cls.servers_client.show_server(server_id)['server']
-        if new_flavor_id != server['flavor']['id']:
-            msg = ('Flavor id of %s is not equal to new_flavor_id.'
-                   % server_id)
-            raise lib_exc.TempestException(msg)
+        # Nova API > 2.46 no longer includes flavor.id
+        if server['flavor'].get('id'):
+            if new_flavor_id != server['flavor']['id']:
+                msg = ('Flavor id of %s is not equal to new_flavor_id.'
+                       % server_id)
+                raise lib_exc.TempestException(msg)
 
     @classmethod
     def delete_volume(cls, volume_id):