diff --git a/conftest.py b/conftest.py
index 1b7e5c4..af3e5dc 100644
--- a/conftest.py
+++ b/conftest.py
@@ -62,7 +62,7 @@ def pytest_collection_modifyitems(session, config, items):
     # First, check if we should run server tests or client tests
     server_tests = client_tests = False
     if _IrcTestCase.controllerClass is None:
-        return
+        pass
     elif issubclass(_IrcTestCase.controllerClass, BaseServerController):
         server_tests = True
     elif issubclass(_IrcTestCase.controllerClass, BaseClientController):