diff --git a/setup/linux-installer.sh b/setup/linux-installer.sh
index 94bcf0ad68..de13d08c09 100644
--- a/setup/linux-installer.sh
+++ b/setup/linux-installer.sh
@@ -1,3 +1,4 @@
+#!/bin/sh
 # linux-installer.sh
 # Copyright (C) 2018 Kovid Goyal <kovid at kovidgoyal.net>