diff --git a/tox.ini b/tox.ini
index d941b6d78..8348f8148 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,7 @@ envlist =
        {py27,py32,py33,py34}-django{17,18,master}
 
 [testenv]
-commands = ./runtests.py --fast {posargs}
+commands = ./runtests.py --fast {posargs} --coverage
 setenv =
        PYTHONDONTWRITEBYTECODE=1
 deps =