diff --git a/tox.ini b/tox.ini
index 86850bb..25f5a0d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,7 +18,7 @@ passenv = CI
           TRAVIS_COMMIT
 
 [flake8]
-ignore = E265
+ignore = E265,E731
 exclude = tabellarius/imapclient
 max-line-length = 140