diff --git a/tools/test-requires b/tools/test-requires
index ce17e70c9..ef9024f57 100644
--- a/tools/test-requires
+++ b/tools/test-requires
@@ -5,6 +5,7 @@ discover
 fixtures
 mox
 pep8==1.3.3
+pyflakes
 python-subunit
 testrepository
 testtools
diff --git a/tox.ini b/tox.ini
index 534e01e7c..8034e9f93 100644
--- a/tox.ini
+++ b/tox.ini
@@ -21,7 +21,7 @@ downloadcache = ~/cache/pip
 # deps = pep8==1.3.3
 # commands =
 #  pep8 --ignore=E125,E126,E711,E712 --repeat --show-source --exclude=.venv,.tox,dist,doc,openstack .
-commands = bash tools/run_pep8.sh
+commands = {toxinidir}/tools/run_pep8.sh
 
 [testenv:cover]
 setenv = NOSE_WITH_COVERAGE=1