diff --git a/nova/compute/api.py b/nova/compute/api.py
index 9804cf58f06d..0f4186871014 100644
--- a/nova/compute/api.py
+++ b/nova/compute/api.py
@@ -2539,7 +2539,7 @@ class API(base.Base):
             elevated, instance.uuid, 'finished')
 
         # reverse quota reservation for increased resource usage
-        deltas = compute_utils.reverse_upsize_quota_delta(context, migration)
+        deltas = compute_utils.reverse_upsize_quota_delta(context, instance)
         quotas = compute_utils.reserve_quota_delta(context, deltas, instance)
 
         instance.task_state = task_states.RESIZE_REVERTING
diff --git a/nova/compute/utils.py b/nova/compute/utils.py
index 908e88c48b1b..0c7af8523ae9 100644
--- a/nova/compute/utils.py
+++ b/nova/compute/utils.py
@@ -455,16 +455,12 @@ def upsize_quota_delta(context, new_flavor, old_flavor):
     return resize_quota_delta(context, new_flavor, old_flavor, 1, 1)
 
 
-def reverse_upsize_quota_delta(context, migration_ref):
+def reverse_upsize_quota_delta(context, instance):
     """Calculate deltas required to reverse a prior upsizing
     quota adjustment.
     """
-    old_flavor = objects.Flavor.get_by_id(
-        context, migration_ref['old_instance_type_id'])
-    new_flavor = objects.Flavor.get_by_id(
-        context, migration_ref['new_instance_type_id'])
-
-    return resize_quota_delta(context, new_flavor, old_flavor, -1, -1)
+    return resize_quota_delta(context, instance.new_flavor,
+                              instance.old_flavor, -1, -1)
 
 
 def downsize_quota_delta(context, instance):
diff --git a/nova/tests/unit/compute/test_compute_api.py b/nova/tests/unit/compute/test_compute_api.py
index 5bf57d2cbbe6..67dddee1e610 100644
--- a/nova/tests/unit/compute/test_compute_api.py
+++ b/nova/tests/unit/compute/test_compute_api.py
@@ -1375,7 +1375,7 @@ class _ComputeAPIUnitTestMixIn(object):
                 self.context, fake_inst['uuid'], 'finished').AndReturn(
                         fake_mig)
         compute_utils.reverse_upsize_quota_delta(
-            self.context, fake_mig).AndReturn('deltas')
+            self.context, fake_inst).AndReturn('deltas')
 
         resvs = ['resvs']
         fake_quotas = objects.Quotas.from_reservations(self.context, resvs)
@@ -1433,7 +1433,7 @@ class _ComputeAPIUnitTestMixIn(object):
 
         delta = ['delta']
         compute_utils.reverse_upsize_quota_delta(
-            self.context, fake_mig).AndReturn(delta)
+            self.context, fake_inst).AndReturn(delta)
         resvs = ['resvs']
         fake_quotas = objects.Quotas.from_reservations(self.context, resvs)
         compute_utils.reserve_quota_delta(
diff --git a/nova/tests/unit/compute/test_compute_utils.py b/nova/tests/unit/compute/test_compute_utils.py
index 7efd02a68eb0..594d68c32cc1 100644
--- a/nova/tests/unit/compute/test_compute_utils.py
+++ b/nova/tests/unit/compute/test_compute_utils.py
@@ -46,7 +46,6 @@ from nova.tests.unit import fake_notifier
 from nova.tests.unit import fake_server_actions
 import nova.tests.unit.image.fake
 from nova.tests.unit.objects import test_flavor
-from nova.tests.unit.objects import test_migration
 from nova.tests import uuidsentinel as uuids
 
 
@@ -684,8 +683,7 @@ class ComputeUtilsQuotaDeltaTestCase(test.TestCase):
         deltas = compute_utils.downsize_quota_delta(self.context, inst)
         self.assertEqual(expected_deltas, deltas)
 
-    @mock.patch.object(objects.Flavor, 'get_by_id')
-    def test_reverse_quota_delta(self, mock_get_flavor):
+    def test_reverse_quota_delta(self):
         inst = create_instance(self.context, params=None)
         inst.old_flavor = flavors.get_flavor_by_name('m1.tiny')
         inst.new_flavor = flavors.get_flavor_by_name('m1.medium')
@@ -696,20 +694,8 @@ class ComputeUtilsQuotaDeltaTestCase(test.TestCase):
             'ram': -1 * (inst.new_flavor['memory_mb'] -
                          inst.old_flavor['memory_mb'])
         }
-        updates = {'old_instance_type_id': inst.old_flavor['id'],
-                   'new_instance_type_id': inst.new_flavor['id']}
 
-        fake_migration = test_migration.fake_db_migration(**updates)
-
-        def _flavor_get_by_id(context, type_id):
-            if type_id == updates['old_instance_type_id']:
-                return inst.old_flavor
-            else:
-                return inst.new_flavor
-
-        mock_get_flavor.side_effect = _flavor_get_by_id
-        deltas = compute_utils.reverse_upsize_quota_delta(self.context,
-                                                          fake_migration)
+        deltas = compute_utils.reverse_upsize_quota_delta(self.context, inst)
         self.assertEqual(expected_deltas, deltas)
 
     @mock.patch.object(objects.Quotas, 'reserve')