diff --git a/tox.ini b/tox.ini
index 83fb3d91d..d1ac9fc2f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -260,6 +260,7 @@ commands =
 # WORKAROUND for https://github.com/tox-dev/tox/issues/503
 install_command = pip install --exists-action w {opts} {packages}
 basepython = {env:PYTHON:python3}
+passenv = APPDATA
 deps =
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/misc/requirements/requirements-pyinstaller.txt