Index: trac/web/standalone.py
===================================================================
--- trac/web/standalone.py	(revision 6489)
+++ trac/web/standalone.py	(working copy)
@@ -89,7 +89,7 @@
         return self.application(environ, start_response)
 
 
-class TracHTTPServer(ThreadingMixIn, WSGIServer):
+class TracHTTPServer(WSGIServer):
 
     def __init__(self, server_address, application, env_parent_dir, env_paths):
         WSGIServer.__init__(self, server_address, application,