diff --git a/tox.ini b/tox.ini
index 9b2a98b..7cd753f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,7 @@
 [tox]
 envlist = py27,py34
+[pep8]
+max-line-length = 100
 [testenv]
 deps=
     pytest
@@ -10,7 +12,7 @@ deps=
     semver
     pydocstyle
 commands=
-    pep8 trezor_agent --max-line-length=100
+    pep8 trezor_agent
     pylint --reports=no --rcfile .pylintrc trezor_agent
     pydocstyle trezor_agent
     coverage run --omit='trezor_agent/__main__.py' --source trezor_agent -m py.test -v trezor_agent