diff --git a/installer.sh b/installer.sh
index 89bc4c8..10fff7b 100644
--- a/installer.sh
+++ b/installer.sh
@@ -25,8 +25,11 @@ sudo raspi-config nonint do_i2c 0
 # Installeren van avrdude
 echo -e "${green}Avrdude installeren...${reset}"
 sudo apt-get install bison flex byacc -y
+sudo rm -rf /opt/avrdude-7.0
+cd /opt
 wget http://download.savannah.gnu.org/releases/avrdude/avrdude-7.0.tar.gz
-tar xfv avrdude-7.0.tar.gz && cd avrdude-7.0/
+sudo tar xfv avrdude-7.0.tar.gz
+cd avrdude-7.0/
 ./configure --enable-linuxgpio
 make
 sudo make install
@@ -58,8 +61,10 @@ sudo python3 setup.py build
 sudo python3 setup.py install
 
 # Installeren en aanpassen van WiringPi
-cd /home/pi && git clone https://github.com/WiringPi/WiringPi
-cd WiringPi && sudo rm wiringPi/wiringPiLegacy.c
+cd /home/pi
+git clone https://github.com/WiringPi/WiringPi
+cd WiringPi
+sudo rm wiringPi/wiringPiLegacy.c
 cat > wiringPi/wiringPiLegacy.c <<EOL
 #include <wiringPi.h>
 #include "wiringPiLegacy.h"
@@ -107,8 +112,11 @@ int piGpioLayoutLegacy(void) {
 EOL
 
 # Installeren van WiringPi python
-cd /home/pi && git clone git clone --recursive https://github.com/WiringPi/WiringPi-Python.git
-cd WiringPi-Python && sudo rm -rf WiringPi && sudo cp -r /home/pi/WiringPi /home/pi/WiringPi-Python/
+cd /home/pi
+git clone git clone --recursive https://github.com/WiringPi/WiringPi-Python.git
+cd WiringPi-Python
+sudo rm -rf WiringPi
+sudo cp -r /home/pi/WiringPi /home/pi/WiringPi-Python/
 sudo python3 setup.py build
 sudo python3 setup.py install