diff --git a/nova/tests/unit/objects/test_instance_pci_requests.py b/nova/tests/unit/objects/test_instance_pci_requests.py
index 3a19be4..b1ff903 100644
--- a/nova/tests/unit/objects/test_instance_pci_requests.py
+++ b/nova/tests/unit/objects/test_instance_pci_requests.py
@@ -96,6 +96,19 @@ class TestInstancePCIRequestSpec(test.NoDBTestCase):


 class _TestInstancePCIRequests(object):
+    def test_old_node_sends_old_format_to_new_node(self):
+        # This is what a primitive from v1.1 would look like
+        request_v1_1 = {'nova_object.changes': ['count'],
+                        'nova_object.data': {'spec': [{'foo': 'bar'}]},
+                        'nova_object.name': 'InstancePCIRequest',
+                        'nova_object.namespace': 'nova',
+                        'nova_object.version': '1.2'}
+
+        # Pretend we're a new node receiving the above over RPC from
+        # either an older node, or a node who has backported it
+        # to v1.1 because there are old nodes in the cluster.
+        objects.InstancePCIRequest.obj_from_primitive(request_v1_1)
+
     @mock.patch('nova.db.instance_extra_get_by_instance_uuid')
     def test_get_by_instance_uuid(self, mock_get):
         pci_requests = copy.deepcopy(fake_pci_requests)