diff --git a/Documents/bin/gen-bash-completion b/Documents/bin/gen-bash-completion
index 1d5a7d802281650b7b2cbb21bc5911f11693d206..b7b21d0364df107f902e9b9531f37b5f56d07773 100755
--- a/Documents/bin/gen-bash-completion
+++ b/Documents/bin/gen-bash-completion
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 set -eu
 
 gen_completion () {