diff --git a/tox.ini b/tox.ini
index c7a89b7..8dc582a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,17 +1,19 @@
 [tox]
 envlist=flake8,py3
 
 [testenv:py3]
 deps =
   swh.core[http] >= 0.0.61
   .[testing]
   pytest-cov
 commands =
-  pytest --cov=swh --cov-branch {posargs}
+  pytest --cov={envsitepackagesdir}/swh/lister/ --cov-branch \
+         {envsitepackagesdir}/swh/lister/ {posargs}
+
 
 [testenv:flake8]
 skip_install = true
 deps =
   flake8
 commands =
   {envpython} -m flake8