diff --git a/tools/run-mypy b/tools/run-mypy
index 75d26b5..e5847a2 100755
--- a/tools/run-mypy
+++ b/tools/run-mypy
@@ -22,7 +22,6 @@ exclude = """
 zulip/integrations/perforce/git_p4.py
 
 zulip_bots/zulip_bots/bots
-zulip_bots/zulip_bots/test_run.py
 zulip_bots/zulip_bots/zulip_bot_output.py
 
 zulip_botserver/tests/__init__.py
diff --git a/zulip_bots/zulip_bots/test_run.py b/zulip_bots/zulip_bots/test_run.py
index 6871e60..3984934 100644
--- a/zulip_bots/zulip_bots/test_run.py
+++ b/zulip_bots/zulip_bots/test_run.py
@@ -26,6 +26,7 @@ class TestDefaultArguments(TestCase):
     @patch('sys.argv', ['zulip-run-bot', 'giphy', '--config-file', '/foo/bar/baz.conf'])
     @patch('zulip_bots.run.run_message_handler_for_bot')
     def test_argument_parsing_with_bot_name(self, mock_run_message_handler_for_bot):
+        # type: (mock.Mock) -> None
         zulip_bots.run.main()
         mock_run_message_handler_for_bot.assert_called_with(bot_name='giphy',
                                                             config_file='/foo/bar/baz.conf',
@@ -35,6 +36,7 @@ class TestDefaultArguments(TestCase):
     @patch('sys.argv', ['zulip-run-bot', path_to_bot, '--config-file', '/foo/bar/baz.conf'])
     @patch('zulip_bots.run.run_message_handler_for_bot')
     def test_argument_parsing_with_bot_path(self, mock_run_message_handler_for_bot):
+        # type: (mock.Mock) -> None
         zulip_bots.run.main()
         mock_run_message_handler_for_bot.assert_called_with(
             bot_name='giphy',