diff --git a/setup.cfg b/setup.cfg
index 92051682..bf012c6b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -6,5 +6,5 @@ omit =
     mitogen/compat/*
 
 [flake8]
-ignore = E402,E128,W503
+ignore = E402,E128,W503,E731
 exclude = mitogen/compat