diff --git a/tox.ini b/tox.ini
index e25901d31..6fceddeed 100644
--- a/tox.ini
+++ b/tox.ini
@@ -85,7 +85,9 @@ commands =
 basepython = python3
 deps =
     -r{toxinidir}/misc/requirements/requirements-pip.txt
+    -r{toxinidir}/requirements.txt
     -r{toxinidir}/misc/requirements/requirements-vulture.txt
+setenv = PYTHONPATH={toxinidir}
 commands =
     {envpython} scripts/link_pyqt.py --tox {envdir}
     {envpython} scripts/dev/run_vulture.py