diff --git a/tox.ini b/tox.ini
index 2356ffc74..7b47a4793 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,7 +34,7 @@ deps =
 [flake8]
 # we aim for 79, but this suppresses warnings for now...
 max-line-length = 120
-ignore = E127,E128,E241,FI12,FI14,FI15,FI50,FI51,FI53,FI54,FI55
+ignore = E127,E128,E241,FI12,FI14,FI15,FI50,FI51,FI53,FI54,FI55,W504
 require-code = True
 min-version = 2.7