diff --git a/tox.ini b/tox.ini
index 564f205..d740130 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,5 +2,5 @@
 deps =
 	-rtests/requirements.txt
 
-commands = py.test
+commands = py.test {posargs}
 usedevelop = True