diff --git a/src/libcharon/plugins/vici/python/tox.sh b/src/libcharon/plugins/vici/python/tox.sh
index 1a4f786..d52b626 100755
--- a/src/libcharon/plugins/vici/python/tox.sh
+++ b/src/libcharon/plugins/vici/python/tox.sh
@@ -1,3 +1,3 @@
 #!/bin/sh
 
-${TOX} -c ${srcdir} --skip-missing-interpreters
+${TOX} -c ${srcdir} --skip-missing-interpreters --sitepackages