diff --git a/tox.ini b/tox.ini
index 502915d7f..9377f5bc8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,7 +24,7 @@ deps =
 # on Ubuntu Trusty.
 commands =
     {envpython} scripts/link_pyqt.py --tox {envdir}
-    {envpython} -m py.test
+    {envpython} -m py.test {posargs}
 
 [testenv:coverage]
 deps =
@@ -34,7 +34,7 @@ deps =
     cov-core==1.15.0
 commands =
     {[testenv:mkvenv]commands}
-    {envpython} -m py.test --cov qutebrowser --cov-report term --cov-report html
+    {envpython} -m py.test --cov qutebrowser --cov-report term --cov-report html {posargs}
 
 [testenv:misc]
 commands =