diff --git a/docker/common/cinder/cinder-backup/config-external.sh b/docker/common/cinder/cinder-backup/config-external.sh
index 28062efc55..5f57ab939a 100644
--- a/docker/common/cinder/cinder-backup/config-external.sh
+++ b/docker/common/cinder/cinder-backup/config-external.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 SOURCE="/opt/kolla/cinder/cinder.conf"
 TARGET="/etc/cinder/cinder.conf"
 OWNER="cinder"