diff --git a/bin/shell/bastion-sync-helper.sh b/bin/shell/bastion-sync-helper.sh
index 82573ce..f94f9ac 100755
--- a/bin/shell/bastion-sync-helper.sh
+++ b/bin/shell/bastion-sync-helper.sh
@@ -1,4 +1,4 @@
-#! /usr/bin/env bash
+#!/bin/sh
 # vim: set filetype=sh ts=4 sw=4 sts=4 et:
 if [ "$USER" != "bastionsync" ]; then
     echo "Unexpected user, aborting" >&2