diff --git a/tox.ini b/tox.ini
index 4be595273..9a24f225e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -35,5 +35,7 @@ ignore =
     E501,
     # do not use bare 'except'
     E722,
+    # line break before binary operator
+    W503, 
     # line break after binary operator 
     W504