diff --git a/install-paperless-ngx.sh b/install-paperless-ngx.sh
index c05a4b36c..469f96005 100755
--- a/install-paperless-ngx.sh
+++ b/install-paperless-ngx.sh
@@ -321,7 +321,7 @@ fi
 wget "https://raw.githubusercontent.com/paperless-ngx/paperless-ngx/main/docker/compose/docker-compose.$DOCKER_COMPOSE_VERSION.yml" -O docker-compose.yml
 wget "https://raw.githubusercontent.com/paperless-ngx/paperless-ngx/main/docker/compose/.env" -O .env
 
-SECRET_KEY=$(tr -dc 'a-zA-Z0-9' < /dev/urandom | fold -w 64 | head -n 1)
+SECRET_KEY=$(tr --delete --complement 'a-zA-Z0-9' < /dev/urandom 2>/dev/null | head --bytes 64)
 
 DEFAULT_LANGUAGES=("deu eng fra ita spa")