diff --git a/vmware_nsx/tests/unit/nsx_v/test_plugin.py b/vmware_nsx/tests/unit/nsx_v/test_plugin.py
index faa9212513..3ab61d1c9a 100644
--- a/vmware_nsx/tests/unit/nsx_v/test_plugin.py
+++ b/vmware_nsx/tests/unit/nsx_v/test_plugin.py
@@ -15,6 +15,7 @@
 
 import contextlib
 import copy
+import itertools
 
 from eventlet import greenthread
 import mock
@@ -1074,8 +1075,8 @@ class TestPortsV2(NsxVPluginV2TestCase,
         # simulate duplicate mac generation to make sure DBDuplicate is retried
         responses = ['12:34:56:78:00:00', '12:34:56:78:00:00',
                      '12:34:56:78:00:01']
-        with mock.patch.object(net, 'get_random_mac',
-                               side_effect=responses) as grand_mac:
+        with mock.patch.object(net, 'random_mac_generator',
+                        return_value=itertools.cycle(responses)) as grand_mac:
             with self.subnet(enable_dhcp=False) as s:
                 with self.port(subnet=s) as p1, self.port(subnet=s) as p2:
                     self.assertEqual('12:34:56:78:00:00',