2 files changed, 7 insertions, 7 deletions

diff --git a/src/mailman/rest/listconf.py b/src/mailman/rest/listconf.py
index f4458b0f9..62b21644a 100644
--- a/src/mailman/rest/listconf.py
+++ b/src/mailman/rest/listconf.py
@@ -218,9 +218,9 @@ class ListConfiguration:
     def on_patch(self, request, response):
         """Patch the configuration (i.e. partial update)."""
         if self._attribute is None:
-            # We're PATCHing one more attributes on the list's configuration
-            # resource, so all the writable attributes are valid candidates
-            # for updating.
+            # We're PATCHing one or more of the attributes on the list's
+            # configuration resource, so all the writable attributes are valid
+            # candidates for updating.
             converters = ATTRIBUTES
         else:
             # We're PATCHing a specific list configuration attribute
@@ -247,7 +247,7 @@ class ListConfiguration:
             # This is the case where the URL points to the list's entire
             # configuration resource, but the request dictionary contains a
             # nonexistent attribute.
-            not_found(
+            bad_request(
                 response, 'Unknown attribute: {}'.format(error.attribute))
             return
         except ReadOnlyPATCHRequestError as error:
diff --git a/src/mailman/rest/tests/test_listconf.py b/src/mailman/rest/tests/test_listconf.py
index 692541bcb..0552233bb 100644
--- a/src/mailman/rest/tests/test_listconf.py
+++ b/src/mailman/rest/tests/test_listconf.py
@@ -33,8 +33,8 @@ from mailman.testing.layers import RESTLayer
 from urllib.error import HTTPError
 
 
-# The representation of the listconf resource as a dictionary.  This is
-# required when PUTting to the list's configuration resource.
+# The representation of the listconf resource as a dictionary.  This is used
+# when PUTting to the list's configuration resource.
 RESOURCE = dict(
     acceptable_aliases=[
         'ant@example.com',
@@ -212,7 +212,7 @@ class TestConfiguration(unittest.TestCase):
             call_api('http://localhost:9001/3.0/lists/ant.example.com/config',
                     dict(bogus=1),
                     'PATCH')
-        self.assertEqual(cm.exception.code, 404)
+        self.assertEqual(cm.exception.code, 400)
         self.assertEqual(cm.exception.reason, b'Unknown attribute: bogus')
 
     def test_read_only_patch_attribute(self):