diff --git a/contrib/gitian-build.sh b/contrib/gitian-build.sh
index 94d6a89c7..5a925f228 100755
--- a/contrib/gitian-build.sh
+++ b/contrib/gitian-build.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 # Copyright (c) 2016 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.