diff --git a/tests/app/main/views/test_manage_users.py b/tests/app/main/views/test_manage_users.py
index 1b4cae6db..de146a148 100644
--- a/tests/app/main/views/test_manage_users.py
+++ b/tests/app/main/views/test_manage_users.py
@@ -16,6 +16,7 @@ def test_should_show_overview_page(
 
         assert 'Manage team' in response.get_data(as_text=True)
         assert response.status_code == 200
+        mock_get_users_by_service.assert_called_once_with(service_id='55555')
 
 
 def test_should_show_page_for_one_user(
diff --git a/tests/conftest.py b/tests/conftest.py
index 2b3f57ab8..ff8e7659f 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -525,4 +525,4 @@ def mock_get_users_by_service(mocker):
                  'email_address': 'notify@digital.cabinet-office.gov.uk',
                  'failed_login_count': 0}]
         return data
-    return mocker.patch('app.user_api_client.get_users_for_service', side_effect=_get_users_for_service)
+    return mocker.patch('app.user_api_client.get_users_for_service', side_effect=_get_users_for_service, autospec=True)