diff --git a/Dockerfile b/Dockerfile
index 8e43097..20370d4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,7 +14,6 @@ RUN apt-get update && apt-get install -y \
         ffmpeg \
         git \
         gnupg2 \
-        libavahi-compat-libdnssd-dev \
         libfontconfig \
         libpam0g-dev \
         libpcap-dev \
diff --git a/scripts/avahi_startup.sh b/scripts/avahi_startup.sh
index 53e304b..ce0a015 100644
--- a/scripts/avahi_startup.sh
+++ b/scripts/avahi_startup.sh
@@ -7,7 +7,7 @@ then
   echo "Avahi already installed..."
 else
   echo "Installing avahi-daemon..."
-  apt-get update && apt-get install -y avahi-daemon && rm -rf /var/lib/apt/lists/*
+  apt-get update && apt-get install -y libavahi-compat-libdnssd-dev avahi-daemon && rm -rf /var/lib/apt/lists/*
   echo "Configuring avahi-daemon..."
   sed -i '/^rlimit-nproc/s/^\(.*\)/#\1/g' /etc/avahi/avahi-daemon.conf
   echo "Configuring dbus..."
diff --git a/scripts/iobroker_startup.sh b/scripts/iobroker_startup.sh
index b609143..ed65952 100644
--- a/scripts/iobroker_startup.sh
+++ b/scripts/iobroker_startup.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Checking env-variables
 packages=$PACKAGES
@@ -11,7 +11,7 @@ cd /opt/iobroker
 
 echo 'Startupscript running...'
 
-if [ `ls -1a|wc -l` -lt 3 ];
+if [ `ls -1a|wc -l` -lt 3 ]
 then
   echo 'Directory /opt/iobroker is empty!'
   echo 'Restoring...'
@@ -19,7 +19,7 @@ then
 	echo 'Restoring done...'
 fi
 
-if [ -f /opt/iobroker/.install_host ];
+if [ -f /opt/iobroker/.install_host ]
 then
   echo 'First run preparation! Used Hostname:' $(hostname)
 	echo 'Renaming ioBroker...'
@@ -28,7 +28,7 @@ then
 	echo 'First run preparation done...'
 fi
 
-if [ "$avahi" == "true"];
+if [ "$avahi" = "true" ]
 then
   echo 'Initializing Avahi-Daemon...'
   sudo sh /opt/scripts/avahi_startup.sh