diff --git a/tox.ini b/tox.ini
index d272e7f..e6fc509 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,40 +5,47 @@ envlist=py26-1.2,py26-1.3,py26,py26-trunk,py27-1.2,py27-1.3,py27,py27-trunk
 deps=
   django==1.4.3
   South==0.7.3
-commands=python setup.py test
- 
+  coverage==3.6
+commands=coverage run --branch setup.py test
+
 [testenv:py26-1.2]
 basepython=python2.6
 deps=
   django==1.2.7
   South==0.7.3
- 
+  coverage==3.6
+
 [testenv:py26-1.3]
 basepython=python2.6
 deps=
   django==1.3.5
   South==0.7.3
+  coverage==3.6
 
 [testenv:py26-trunk]
 basepython=python2.6
 deps=
   https://github.com/django/django/tarball/master
   South==0.7.3
+  coverage==3.6
 
 [testenv:py27-1.2]
 basepython=python2.7
 deps=
   django==1.2.7
   South==0.7.3
+  coverage==3.6
 
 [testenv:py27-1.3]
 basepython=python2.7
 deps=
   django==1.3.5
   South==0.7.3
+  coverage==3.6
 
 [testenv:py27-trunk]
 basepython=python2.7
 deps=
   https://github.com/django/django/tarball/master
   South==0.7.3
+  coverage==3.6