diff --git a/build-aux/cargo.sh b/build-aux/cargo.sh
old mode 100644
new mode 100755
index 23fc4b3..425f0c0
--- a/build-aux/cargo.sh
+++ b/build-aux/cargo.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -euo pipefail