diff --git a/tox.ini b/tox.ini
index 823c9a8..33f7aab 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,19 +10,20 @@ setenv =
    VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = 
+commands =
     python setup.py testr --coverage --slowest --testr-args='{posargs}'
     coverage combine
     coverage report -m
 
 [testenv:pep8]
 commands = flake8 {posargs} anchor
+    flake8 {posargs} tests
 
 [testenv:venv]
 commands = {posargs}
 
 [testenv:cover]
-commands = 
+commands =
     python setup.py testr --coverage --testr-args='{posargs}'
     coverage combine
     coverage xml