diff --git a/scripts/xon.sh b/scripts/xon.sh
index ecc0292c0..073cc3f1b 100755
--- a/scripts/xon.sh
+++ b/scripts/xon.sh
@@ -7,4 +7,4 @@ if [ -z "${LC_ALL+x}" ] && [ -z "${LC_CTYPE+x}" ] && \
 fi
 
 # run python
-exec /usr/bin/env PYTHONUNBUFFERED=1 python3 -u -m xonsh "$@"
+exec /usr/bin/env -S PYTHONUNBUFFERED=1 python3 -u -m xonsh "$@"