diff --git a/build-index.sh b/build-index.sh
index c23e96e..aa6e60c 100755
--- a/build-index.sh
+++ b/build-index.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 # defin the target dir
 parent=$(dirname "${BASH_SOURCE[0]}")