diff --git a/tox.ini b/tox.ini
index cdc260ea13..1698c923f4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,17 +4,15 @@ envlist = py26, py27, pypy, docs, lint
 [testenv]
 deps =
     coverage
-    unittest2
-    discover
 commands =
     coverage erase
-    coverage run -m unittest discover
+    coverage run {envbindir}/trial --rterrors {posargs:mimic}
     coverage report -m
 
 [testenv:py26]
 commands =
     coverage erase
-    coverage run -m discover
+    coverage run {envbindir}/trial --rterrors {posargs:mimic}
     coverage report -m
 
 [testenv:docs]