diff --git a/integration-tests/append-patches/append-patches.sh b/integration-tests/append-patches/append-patches.sh
index 356eabd4..31f92b53 100755
--- a/integration-tests/append-patches/append-patches.sh
+++ b/integration-tests/append-patches/append-patches.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 # make sure errors stop the script
 set -e