diff --git a/scripts/slack b/scripts/slack
index 293f8070504074b37be98ccc30e4284df58f9170..3ce2b4553ee1fa4063c312b8e3fb20c5ef782bf3 100755
--- a/scripts/slack
+++ b/scripts/slack
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 # This is based on https://gitlab.com/gitlab-org/gitlab-qa/-/blob/master/bin/slack
 #
 # Sends Slack notification MSG to CI_SLACK_WEBHOOK_URL (which needs to be set).