diff --git a/tox.ini b/tox.ini
index 1a78ee1..e6c67f0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,6 +3,9 @@ envlist =
     py26-1.5.X, py26-1.6.X, py27-1.5.X, py27-1.6.X, py27-1.7.X, py33-1.5.X, py33-1.6.X, py33-1.7.X, py34-1.5.X, py34-1.6.X, py34-1.7.X
 downloadcache = .tox/_download/
 
+[testenv]
+whitelist_externals=*
+
 [testenv:py26-1.5.X]
 basepython = python2.6
 commands =