diff --git a/debian/cloudstack-agent.postinst b/debian/cloudstack-agent.postinst
index 2a938ad2a9a..9cb178d4f12 100644
--- a/debian/cloudstack-agent.postinst
+++ b/debian/cloudstack-agent.postinst
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file
diff --git a/debian/cloudstack-management.postinst b/debian/cloudstack-management.postinst
index 2a16bc49653..0dbeca9fd49 100644
--- a/debian/cloudstack-management.postinst
+++ b/debian/cloudstack-management.postinst
@@ -1,4 +1,5 @@
-#!/bin/sh -e
+#!/bin/sh
+
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file
 # distributed with this work for additional information
@@ -16,6 +17,8 @@
 # specific language governing permissions and limitations
 # under the License.
 
+set -e
+
 if [ "$1" = configure ]; then
     if ! getent passwd cloud >/dev/null; then
         adduser --quiet --system --group --no-create-home --home /var/lib/cloudstack/management cloud
diff --git a/debian/cloudstack-usage.postinst b/debian/cloudstack-usage.postinst
index 9452d397e4c..95297119d2c 100644
--- a/debian/cloudstack-usage.postinst
+++ b/debian/cloudstack-usage.postinst
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file