diff --git a/tox.ini b/tox.ini
index 35e97a5df..17bca8724 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py26,py27,py33,py34,pep8
+envlist = py27,py33,py34,pep8
 minversion = 1.6
 skipsdist = True
 
@@ -8,6 +8,7 @@ sitepackages = True
 usedevelop = True
 install_command = pip install -U --force-reinstall {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
+         PYTHONDONTWRITEBYTECODE = 1
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =