diff --git a/tox.ini b/tox.ini
index 5c2f38390..e2bdf35f7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,8 +15,8 @@ envdir = {toxinidir}/.venv
 usedevelop = true
 
 [testenv:unittests]
-# https://bitbucket.org/hpk42/tox/issue/246/
-setenv = QT_QPA_PLATFORM_PLUGIN_PATH={envdir}/lib/python3.4/PyQt5/plugins/platforms
+# 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
 deps =
     py==1.4.27