diff --git a/tox.ini b/tox.ini
index acacf755..c4d86518 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,7 +11,8 @@ deps =
     {[testenv]deps}
 [testenv:cov]
 deps =
-    pytest-cov
+    coverage
     {[testenv]deps}
 commands =
-    py.test --cov jedi []
+    coverage run --source jedi -m py.test
+    coverage report