diff --git a/tests/helpers/test_entity_component.py b/tests/helpers/test_entity_component.py
index a95c4a6d0fd..1e12d7c3ea3 100644
--- a/tests/helpers/test_entity_component.py
+++ b/tests/helpers/test_entity_component.py
@@ -292,7 +292,7 @@ class TestHelpersEntityComponent(unittest.TestCase):
         assert platform2_setup.called
 
     @patch('homeassistant.helpers.entity_component.EntityComponent'
-           '._async_setup_platform')
+           '._async_setup_platform', return_value=mock_coro()())
     @patch('homeassistant.bootstrap.async_setup_component',
            return_value=mock_coro(True)())
     def test_setup_does_discovery(self, mock_setup_component, mock_setup):