diff --git a/installation/install-openems.sh b/installation/install-openems.sh
index 44d07e5..3557e9c 100755
--- a/installation/install-openems.sh
+++ b/installation/install-openems.sh
@@ -1,4 +1,5 @@
 #! /bin/bash
+set -euo pipefail
 
 RED='\033[0;31m'
 YELLOW='\033[1;33m'
@@ -67,7 +68,7 @@ wget -O ~/openems-ui.zip https://git.mumme-it.de/Mumme-IT/openems-build/raw/main
 sudo unzip -o ~/openems-ui.zip -d /var/www/openems/html
 sudo rm ~/openems-ui.zip
 
-wget -O /etc/nginx/sites-available/openems https://git.mumme-it.de/Mumme-IT/openems-build/src/branch/main/installation/nginx-config
+sudo wget -O /etc/nginx/sites-available/openems https://git.mumme-it.de/Mumme-IT/openems-build/src/branch/main/installation/nginx-config
 sudo ln -sf /etc/nginx/sites-available/openems "/etc/nginx/sites-enabled/$host"
 
 if $ui_default; then