diff --git a/tox.ini b/tox.ini
index a231b9c..f330efc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,9 +3,6 @@ envlist = py{26,27,34,py,py3}, docs, style
 
 
 [testenv]
-# by default tox runs with --pre which tickles this bug:
-# https://bitbucket.org/pypy/pypy/issue/1894/keyerror-core-dumped-on-unicode-triple
-install_command = pip install {opts} {packages}
 commands =
     py.test [] jsonschema
     {envpython} -m doctest README.rst