diff --git a/tox.ini b/tox.ini
index 8e0ede6..06b37df 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,4 +1,5 @@
 [tox]
+minversion = 1.6
 envlist = pep8, pyflakes, py27
 
 [testenv]
@@ -6,6 +7,7 @@
 setenv = STATSD_HOST=localhost
          STATSD_PORT=8125
          VIRTUAL_ENV={envdir}
+install_command = pip install {opts} {packages}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =