diff --git a/tox.ini b/tox.ini
index 15f201b3..31e25d4f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,7 @@
 envlist = flake8, py27, py3
 
 [flake8]
-ignore = E731
+ignore = E731,W504
 max-line-length = 100
 exclude =
     ./.tox