diff --git a/tox.ini b/tox.ini
index 5412ac3..b5555cc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,7 @@ deps = nose
        pytest
        pytest-cov
        hypothesis
-commands = py.test
+commands = py.test --cov reports
 
 [testenv:docs]
 basepython = python