diff --git a/MANIFEST.in b/MANIFEST.in
index e7c46fc..c328571 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,4 +1,5 @@
 include Makefile
 include requirements.txt
 include requirements-swh.txt
 include version.txt
+recursive-include swh/loader/debian/tests/resources/ *
diff --git a/tox.ini b/tox.ini
index 70265ee..5f6536f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,17 +1,19 @@
 [tox]
 envlist=flake8,py3
 
 [testenv:py3]
 deps =
   .[testing]
   pytest-cov
   pifpaf
 commands =
-  pifpaf run postgresql -- pytest --cov=swh --cov-branch {posargs}
+  pifpaf run postgresql -- pytest --cov={envsitepackagesdir}/swh/loader/debian \
+         {envsitepackagesdir}/swh/loader/debian \
+         --cov-branch {posargs}
 
 [testenv:flake8]
 skip_install = true
 deps =
   flake8
 commands =
   {envpython} -m flake8