diff --git a/tests/test_webclient.py b/tests/test_webclient.py
index 0a31d8b5d..fa0083d44 100644
--- a/tests/test_webclient.py
+++ b/tests/test_webclient.py
@@ -300,7 +300,7 @@ class WebClientTestCase(unittest.TestCase):
         def cleanup(passthrough):
             # Clean up the server which is hanging around not doing
             # anything.
-            connected = self.wrapper.protocols.keys()
+            connected = list(six.iterkeys(self.wrapper.protocols))
             # There might be nothing here if the server managed to already see
             # that the connection was lost.
             if connected: