diff --git a/gunicorn/workers/gthread.py b/gunicorn/workers/gthread.py
index b6d6247b..a0aebf2f 100644
--- a/gunicorn/workers/gthread.py
+++ b/gunicorn/workers/gthread.py
@@ -46,7 +46,7 @@ class TConn():
     __cmp__ = __lt__
 
 
-class ThreadWorker(base.worker):
+class ThreadWorker(base.Worker):
 
     def __init__(self, *args, **kwargs):
         super(ThreadWorker, self).__init__(*args, **kwargs)