diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index 5ff18cea13479b..611692f764473f 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -2639,6 +2639,7 @@ def tearDown(self):
         self.client.close()
         if self.server.running:
             self.server.stop()
+        self.server = None
 
     def sendfile_wrapper(self, sock, file, offset, nbytes, headers=[], trailers=[]):
         """A higher level wrapper representing how an application is