diff --git a/tox.ini b/tox.ini
index dbfff097..c475542d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,9 @@ filename = *.py
 # E501: line too long
 # H301: one import per line
 # H306: imports not in alphabetical order
-ignore = E501,E402,H301,H306
+# E226: missing whitespace around arithmetic operator
+# W503: line break occured before a binary operator
+ignore = E501,E402,H301,H306,E226,W503
 
 [run]
 omit = tests/*