1 files changed, 3 insertions, 2 deletions
diff --git a/tox.ini b/tox.ini
index 60133f667..60df374ab 100644
--- a/tox.ini
+++ b/tox.ini
@@ -51,7 +51,8 @@ rcfile = {toxinidir}/coverage.ini
 rc = --rcfile={[coverage]rcfile}
 
 [flake8]
-max-line-length = 79
+enable-extensions = U4
 exclude = src/mailman/compat/*.py
+hang-closing = True
 jobs = 1
-enable-extensions = U4
+max-line-length = 79