diff --git a/tox.ini b/tox.ini
index 1b3cd4ef0d39955197448ace9fdf5d26ea6749b4..f7b5aabf37628f57e8e192dfced969541aecfe25 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,3 +11,6 @@ deps=nose
     xlrd == 1.2
     h5py
 commands=py.test --cov=caosadvancedtools -vv {posargs}
+
+[flake8]
+max-line-length=100