diff --git a/nova/tests/unit/volume/test_cinder.py b/nova/tests/unit/volume/test_cinder.py
index 7b325a3a60c4..c7d059aa545e 100644
--- a/nova/tests/unit/volume/test_cinder.py
+++ b/nova/tests/unit/volume/test_cinder.py
@@ -201,6 +201,9 @@ class CinderApiTestCase(test.NoDBTestCase):
                   'attach_status': 'detached',
                   'availability_zone': 'zone2'}
         instance = fake_instance_obj(self.ctx)
+        # Simulate _provision_instances in the compute API; the instance is not
+        # created in the API so the instance will not have an id attribute set.
+        delattr(instance, 'id')
 
         self.assertRaises(exception.InvalidVolume,
                           self.api.check_availability_zone,
diff --git a/nova/volume/cinder.py b/nova/volume/cinder.py
index 91195efdb454..bd99dacd28ea 100644
--- a/nova/volume/cinder.py
+++ b/nova/volume/cinder.py
@@ -278,7 +278,7 @@ class API(object):
                 msg = _("Instance %(instance)s and volume %(vol)s are not in "
                         "the same availability_zone. Instance is in "
                         "%(ins_zone)s. Volume is in %(vol_zone)s") % {
-                            "instance": instance['id'],
+                            "instance": instance.uuid,
                             "vol": volume['id'],
                             'ins_zone': instance_az,
                             'vol_zone': volume['availability_zone']}