--- a/testing/web-platform/tests/webdriver/support/fixtures.py
+++ b/testing/web-platform/tests/webdriver/support/fixtures.py
@@ -121,17 +121,17 @@ def session(configuration, request):
     does not demand that we start a new session per test."""
     global _current_session
     if _current_session is None:
         _current_session = webdriver.Session(configuration["host"],
                                              configuration["port"],
                                              capabilities={"alwaysMatch": configuration["capabilities"]})
     try:
         _current_session.start()
-    except webdriver.errors.SessionNotCreatedException:
+    except webdriver.error.SessionNotCreatedException:
         if not _current_session.session_id:
             raise
 
     # finalisers are popped off a stack,
     # making their ordering reverse
     request.addfinalizer(lambda: _switch_to_top_level_browsing_context(_current_session))
     request.addfinalizer(lambda: _restore_windows(_current_session))
     request.addfinalizer(lambda: _dismiss_user_prompts(_current_session))