diff --git a/Lib/ufo2ft/featureWriters/markFeatureWriter.py b/Lib/ufo2ft/featureWriters/markFeatureWriter.py
index 473541e48..6e4154d08 100644
--- a/Lib/ufo2ft/featureWriters/markFeatureWriter.py
+++ b/Lib/ufo2ft/featureWriters/markFeatureWriter.py
@@ -559,7 +559,7 @@ def _groupAttachments(self, attachments):
                 # We keep the NamedAnchor if the markClass is allowed in the
                 # current lookup.
                 def include(anchor):
-                    return anchor.markClass.name in markClasses
+                    return anchor.markClass.name in markClasses  # noqa: B023
 
                 filteredAttachment = attachment.filter(include)
                 if filteredAttachment: