diff --git a/tox.ini b/tox.ini
index d04cd47c..686a1e7a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@ envlist = py26,py27,py34
 recreate = True
 
 [testenv]
-commands = python -m nose tests
+commands = python -m nose {posargs:tests}
 deps =
      contextlib2
      httpretty>=0.7.1
@@ -13,7 +13,7 @@ deps =
      pyflakes
 
 [testenv:py26]
-commands = nosetests tests
+commands = nosetests {posargs:tests}
 deps =
      contextlib2
      httpretty>=0.7.1