diff --git a/tox.ini b/tox.ini
index fb2abea..1923226 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,44 +1,50 @@
 [tox]
 envlist=flake8,mypy,py3-no-origin-ids,py3
 
 [testenv:py3]
 deps =
   .[testing]
   .[listener]
   pytest-cov
   pifpaf
 commands =
-  pifpaf run postgresql -- pytest --hypothesis-profile=fast --cov=swh --cov-branch {posargs}
+  pifpaf run postgresql -- pytest --hypothesis-profile=fast \
+         --cov={envsitepackagesdir}/swh/storage \
+         {envsitepackagesdir}/swh/storage \
+         --cov-branch {posargs}
 
 [testenv:py3-slow]
 deps =
   .[testing]
   .[listener]
   pytest-cov
   pifpaf
 commands =
-  pifpaf run postgresql -- pytest --hypothesis-profile=slow --cov=swh --cov-branch {posargs}
+  pifpaf run postgresql -- pytest --hypothesis-profile=slow \
+         --cov={envsitepackagesdir}/swh/storage \
+         {envsitepackagesdir}/swh/storage \
+         --cov-branch {posargs}
 
 [testenv:py3-no-origin-ids]
 deps =
   .[testing]
   pytest-cov
 setenv =
   SWH_STORAGE_IN_MEMORY_ENABLE_ORIGIN_IDS=false
 commands =
-  pytest --hypothesis-profile=fast {posargs} swh/storage/tests/test_in_memory.py
+  pytest --hypothesis-profile=fast {posargs} {envsitepackagesdir}/swh/storage/tests/test_in_memory.py
 
 [testenv:flake8]
 skip_install = true
 deps =
   flake8
 commands =
   {envpython} -m flake8
 
 [testenv:mypy]
 skip_install = true
 deps =
   .[testing]
   mypy
 commands =
   mypy swh