diff --git a/tempest/tests/common/test_dynamic_creds.py b/tempest/tests/common/test_dynamic_creds.py
index 5cb204f..4379756 100644
--- a/tempest/tests/common/test_dynamic_creds.py
+++ b/tempest/tests/common/test_dynamic_creds.py
@@ -324,7 +324,7 @@
             'tempest.services.network.json.network_client.NetworkClient.'
             'add_router_interface_with_subnet_id')
         primary_creds = creds.get_primary_creds()
-        router_interface_mock.called_once_with('1234', '1234')
+        router_interface_mock.assert_called_once_with('1234', '1234')
         network = primary_creds.network
         subnet = primary_creds.subnet
         router = primary_creds.router
@@ -356,7 +356,7 @@
             'tempest.services.network.json.network_client.NetworkClient.'
             'add_router_interface_with_subnet_id')
         creds.get_primary_creds()
-        router_interface_mock.called_once_with('1234', '1234')
+        router_interface_mock.assert_called_once_with('1234', '1234')
         router_interface_mock.reset_mock()
         # Create alternate tenant and network
         self._mock_user_create('12345', 'fake_alt_user')
@@ -365,7 +365,7 @@
         self._mock_subnet_create(creds, '12345', 'fake_alt_subnet')
         self._mock_router_create('12345', 'fake_alt_router')
         creds.get_alt_creds()
-        router_interface_mock.called_once_with('12345', '12345')
+        router_interface_mock.assert_called_once_with('12345', '12345')
         router_interface_mock.reset_mock()
         # Create admin tenant and networks
         self._mock_user_create('123456', 'fake_admin_user')
@@ -463,7 +463,7 @@
             'tempest.services.network.json.network_client.NetworkClient.'
             'add_router_interface_with_subnet_id')
         alt_creds = creds.get_alt_creds()
-        router_interface_mock.called_once_with('1234', '1234')
+        router_interface_mock.assert_called_once_with('1234', '1234')
         network = alt_creds.network
         subnet = alt_creds.subnet
         router = alt_creds.router
@@ -488,7 +488,7 @@
             'add_router_interface_with_subnet_id')
         self._mock_list_roles('123456', 'admin')
         admin_creds = creds.get_admin_creds()
-        router_interface_mock.called_once_with('1234', '1234')
+        router_interface_mock.assert_called_once_with('1234', '1234')
         network = admin_creds.network
         subnet = admin_creds.subnet
         router = admin_creds.router