diff --git a/tox.ini b/tox.ini
index b4befcb6..5da86c54 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,7 +15,7 @@ commands = py.test -ra -vvv --strict --cov {posargs}
 [testenv:requirements]
 basepython = python3.4
 deps = prequ==1.3.1
-commands = prequ check -v
+commands = prequ {posargs:check -v}
 
 [testenv:style]
 basepython = python3.4