diff --git a/tox.ini b/tox.ini
index 4210c4fbd48478d94b81e1c91851784950976253..f2c726d273badaeac99d80aa1b1ca0736b1422dd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,6 +3,7 @@ envlist = py36
 
 [flake8]
 exclude = venv,.tox
+max-line-length = 120
 
 [testenv]
 setenv =