diff --git a/tox.ini b/tox.ini
index 091f8929d..0d830327a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -100,7 +100,7 @@ commands =
 basepython = python3
 ignore_errors = true
 skip_install = true
-setenv = PYTHONPATH={toxinidir}/scripts/dev
+setenv = PYTHONPATH={toxinidir}/scripts/dev:{toxinidir}
 passenv =
 deps =
     {[testenv]deps}