diff --git a/debian/additions/innotop/innotop b/debian/additions/innotop/innotop
index 00777b6b9fc..941d3c901cb 100644
--- a/debian/additions/innotop/innotop
+++ b/debian/additions/innotop/innotop
@@ -1,4 +1,4 @@
-#!/usr/bin/env perl
+#!/usr/bin/perl
 
 # vim: tw=160:nowrap:expandtab:tabstop=3:shiftwidth=3:softtabstop=3
 
diff --git a/debian/additions/mysql.init b/debian/additions/mysql.init
old mode 100644
new mode 100755
diff --git a/debian/mariadb-common.postrm b/debian/mariadb-common.postrm
index 027592f816e..14007fb9149 100644
--- a/debian/mariadb-common.postrm
+++ b/debian/mariadb-common.postrm
@@ -1,4 +1,5 @@
-#!/bin/bash -e
+#!/bin/bash
+set -e
 
 if [ "$1" = "purge" ]; then
   rmdir /etc/mysql/conf.d 2>/dev/null || true
diff --git a/debian/mysql-common.postrm b/debian/mysql-common.postrm
index 0d3f8aed83d..4418e5fa304 100644
--- a/debian/mysql-common.postrm
+++ b/debian/mysql-common.postrm
@@ -1,4 +1,5 @@
-#!/bin/bash -e
+#!/bin/bash
+set -e
 
 if [ "$1" = "purge" ]; then
   rmdir /etc/mysql 2>/dev/null || true