diff --git a/lib/functions/rootfs/rootfs-create.sh b/lib/functions/rootfs/rootfs-create.sh
index 612d14311f..ee09e2230e 100644
--- a/lib/functions/rootfs/rootfs-create.sh
+++ b/lib/functions/rootfs/rootfs-create.sh
@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 function create_new_rootfs_cache_tarball() {
 	# validate cache_fname is set
 	[[ -n "${cache_fname}" ]] || exit_with_error "create_new_rootfs_cache_tarball: cache_fname is not set"