diff --git a/tox.ini b/tox.ini
index bf67817..43002fc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,4 +3,4 @@ envlist = py26,py27,py34,pypy
 [testenv]
 changedir = .tox
 deps = -rrequirements-test.txt
-commands = py.test --doctest-modules {envsitepackagesdir}/boltons {toxinidir}/tests
+commands = py.test --doctest-modules {envsitepackagesdir}/boltons {toxinidir}/tests {posargs}