diff --git a/tox.ini b/tox.ini
index 64d19f0dc..aa7fd87e5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -115,7 +115,7 @@ commands =
 [testenv:smoke]
 # https://bitbucket.org/hpk42/tox/issue/246/ - only needed for Windows though
 setenv = QT_QPA_PLATFORM_PLUGIN_PATH={envdir}/Lib/site-packages/PyQt5/plugins/platforms
-passenv = DISPLAY XAUTHORITY HOME
+passenv = DISPLAY XAUTHORITY HOME USERNAME USER
 deps =
     -r{toxinidir}/requirements.txt
 # We don't use {[testenv:mkvenv]commands} here because that seems to be broken