1 files changed, 2 insertions, 4 deletions

diff --git a/src/mailman/runners/tests/test_incoming.py b/src/mailman/runners/tests/test_incoming.py
index 29274cfc6..d813cc34b 100644
--- a/src/mailman/runners/tests/test_incoming.py
+++ b/src/mailman/runners/tests/test_incoming.py
@@ -58,7 +58,9 @@ class TestIncoming(unittest.TestCase):
         self._mlist.posting_chain = 'test posting'
         self._mlist.owner_chain = 'test owner'
         config.chains['test posting'] = Chain('posting')
+        self.addCleanup(config.chains.pop, 'test posting')
         config.chains['test owner'] = Chain('owner')
+        self.addCleanup(config.chains.pop, 'test owner')
         self._in = make_testable_runner(IncomingRunner, 'in')
         self._msg = mfs("""\
 From: anne@example.com
@@ -66,10 +68,6 @@ To: test@example.com
 
 """)
 
-    def tearDown(self):
-        del config.chains['test posting']
-        del config.chains['test owner']
-
     def test_posting(self):
         # A message posted to the list goes through the posting chain.
         msgdata = dict(listid='test.example.com')