diff --git a/tox.ini b/tox.ini
index 6233c03..6a865f2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,52 +1,52 @@
 [tox]
 envlist=flake8,mypy,py3-{core,db,server}
 
 [testenv:py3-core]
 deps =
   -rrequirements-test.txt
   .
 commands =
   pytest --doctest-modules {envsitepackagesdir}/swh/core/tests {posargs}
 
 [testenv:py3-db]
 deps =
   -rrequirements-test.txt
   .[db]
   pifpaf
 commands =
   pifpaf run postgresql -- \
     pytest {envsitepackagesdir}/swh/core/db/tests {posargs}
 
 [testenv:py3-server]
 deps =
   -rrequirements-test.txt
   .[http]
 commands =
   pytest {envsitepackagesdir}/swh/core/api/tests {posargs}
 
 [testenv:py3]
 deps =
   .[testing]
   pytest-cov
   pifpaf
 commands =
   pifpaf run postgresql -- \
     pytest --doctest-modules \
 	       --hypothesis-profile=slow \
-	       --cov=swh --cov-branch \
+	       --cov={envsitepackagesdir}/swh/core --cov-branch \
 		   {envsitepackagesdir}/swh/core {posargs}
 
 [testenv:flake8]
 skip_install = true
 deps =
   flake8
 commands =
   {envpython} -m flake8
 
 [testenv:mypy]
 skip_install = true
 deps =
   .[testing]
   mypy
 commands =
   mypy swh