diff --git a/tox.ini b/tox.ini
index 065a55b..1ac9bfd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,7 +2,7 @@
 distribute = false
 sitepackages = true
 commands =
-    {envpython} compressor/tests/runtests.py
+    {envpython} compressor/tests/runtests.py []
     coverage html -d {envtmpdir}/coverage
 
 [testenv:docs]