diff --git a/tox.ini b/tox.ini
index ff52e29f0..a68a233e0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,8 +11,15 @@ commands = py.test --cov=dosage --cov=dosagelib --tb=short -n10
 passenv = TRAVIS
 # Also install optional dependencies for tests.
 deps =
+    -r{toxinidir}/requirements.txt
     pytest-xdist
     pytest-cov
     pytest-travis-fold
     cssselect
     Pillow
+
+[flake8]
+# we aim for 79, but this suppresses warnings for now...
+max-line-length = 120
+ignore = E121,E126,E241
+exclude = build