diff --git a/tools/tests/zasm/runtests.sh b/tools/tests/zasm/runtests.sh
index 2c20154..87d93c4 100755
--- a/tools/tests/zasm/runtests.sh
+++ b/tools/tests/zasm/runtests.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 set -e