diff --git a/scripts/runtox.sh b/scripts/runtox.sh
index 50da44dd53..146af7c665 100755
--- a/scripts/runtox.sh
+++ b/scripts/runtox.sh
@@ -40,4 +40,4 @@ if [ -z "${ENV}" ]; then
     exit 0
 fi
 
-exec $TOXPATH -e "$ENV" -- "${@:2}"
+exec $TOXPATH -p auto -o -e "$ENV" -- "${@:2}"