diff --git a/src/libcharon/plugins/vici/python/tox.ini b/src/libcharon/plugins/vici/python/tox.ini
index 8a57cfd64..2000478aa 100644
--- a/src/libcharon/plugins/vici/python/tox.ini
+++ b/src/libcharon/plugins/vici/python/tox.ini
@@ -7,7 +7,7 @@ deps =
 	pytest-pycodestyle
 commands = pytest --pycodestyle
 
-[testenv:py27]
+[testenv:py{27,35}]
 deps = pytest
 commands = pytest