diff --git a/tox.ini b/tox.ini
index 0a02d5981..767a4d92c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@ envlist = py27, py35
 [testenv]
 commands = 
     {envbindir}/py.test --cov=dosage --cov=dosagelib --tb=short -n4 \
-        --junitxml={toxworkdir}/junit-{envname}.xml
+        --junitxml={toxworkdir}/junit-{envname}.xml {posargs}
     - {envbindir}/flake8
 passenv = TRAVIS
 # Also install optional dependencies for tests.