diff --git a/tox.ini b/tox.ini
index 69e9d57..4a625f8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,7 +29,7 @@
 sitepackages = True
 setenv = VIRTUAL_ENV={envdir}
 commands =
-  python setup.py testr --slowest --testr-args='{posargs}'
+  bash tools/pretty_tox.sh '{posargs}'
 
 [testenv:full]
 sitepackages = True