diff --git a/dropbear_hook b/dropbear_hook
index 6a9bae7..27d8e95 100644
--- a/dropbear_hook
+++ b/dropbear_hook
@@ -1,4 +1,4 @@
-#!/usr/bin/ash
+#!/bin/sh
 
 run_hook ()
 {
@@ -14,6 +14,6 @@ run_cleanuphook ()
     umount /dev/pts
     rm -R /dev/pts
     if [ -f /var/run/dropbear.pid ]; then
-        kill `cat /var/run/dropbear.pid`
+        kill "$(cat /var/run/dropbear.pid)"
     fi
 }
diff --git a/dropbear_install b/dropbear_install
index 3180883..3120cf7 100644
--- a/dropbear_install
+++ b/dropbear_install
@@ -1,12 +1,12 @@
-#!/bin/bash
+#!/bin/sh
 
 get_fingerprint() {
-  local keyfile="$1"
+  keyfile="$1"
   dropbearkey -y -f "${keyfile}" | sed -n '/^Fingerprint:/ {s/Fingerprint: *//; p}'
 }
 
 display_fingerprints() {
-  local keyfile
+  keyfile
 
   for keyfile in "/etc/dropbear/dropbear_rsa_host_key" "/etc/dropbear/dropbear_ecdsa_host_key" ; do
       if [ -s "${keyfile}" ] ; then
@@ -16,12 +16,12 @@ display_fingerprints() {
 }
 
 copy_openssh_keys() {
-  local osshrsa="/etc/ssh/ssh_host_rsa_key"
-  local osshecdsa="/etc/ssh/ssh_host_ecdsa_key"
+  osshrsa="/etc/ssh/ssh_host_rsa_key"
+  osshecdsa="/etc/ssh/ssh_host_ecdsa_key"
 
-  local dbpre="/etc/dropbear/dropbear_"
+  dbpre="/etc/dropbear/dropbear_"
 
-  local return_code=1
+  return_code=1
 
   if [ -s "$osshrsa" ]; then
       dropbearconvert openssh dropbear $osshrsa ${dbpre}rsa_host_key
@@ -37,7 +37,7 @@ copy_openssh_keys() {
 }
 
 generate_keys() {
-  local keyfile keytype
+  keyfile keytype
   for keytype in rsa ecdsa ; do
       keyfile="/etc/dropbear/dropbear_${keytype}_host_key"
       if [ ! -s "$keyfile" ]; then
@@ -54,16 +54,16 @@ build ()
   #
 
   # Are we even needed?
-  if [ ! -r "/etc/dropbear/root_key" -o ! -s "/etc/dropbear/root_key" ]; then
+  if [ ! -r "/etc/dropbear/root_key" ] || [ ! -s "/etc/dropbear/root_key" ]; then
     echo "There is no root key in /etc/dropbear/root_key existent; exit"
     return 0
   fi
 
   # if TMPDIR is set leave it alone otherwise set
-  [ -z $TMPDIR ] && TMPDIR='/tmp/dropbear_initrd_encrypt'
+  [ -z "$TMPDIR" ] && TMPDIR='/tmp/dropbear_initrd_encrypt'
 
   # check if TMPDIR exsists if not make it
-  [ -d $TMPDIR ] || mkdir -p $TMPDIR
+  [ -d "$TMPDIR" ] || mkdir -p "$TMPDIR"
 
   umask 0022