diff --git a/.flake8 b/.flake8
index 8b428805..6b824e97 100644
--- a/.flake8
+++ b/.flake8
@@ -7,6 +7,8 @@ ignore=
     E114,
     # E402: Module level import not at top of file
     E402,
+    # E731: do not assign a lambda expression, use a def
+    E731,
     # W503: Line break before binary operator
     W503,
     # W504: Line break after binary operator