diff --git a/tox.ini b/tox.ini
index fbfdd87..8c91004 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,6 +6,7 @@ deps =
      pytest
      pytest-cov
      pyquery
+     scipy
 
 [testenv:py26]
 commands=py.test [] --cov {envdir}/lib/python2.6/site-packages/pygal {envdir}/lib/python2.6/site-packages/pygal/test