diff --git a/tox.ini b/tox.ini
index 3705195..79b5c1d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,4 +20,4 @@ deps =
     django_trunk: https://github.com/django/django/tarball/master
     freezegun == 0.3.8
 
-commands = coverage run runtests.py
+commands = coverage run -a runtests.py