diff --git a/scripts/update_single_machine.sh b/scripts/update_single_machine.sh
index 1ceec16..3eb4f87 100755
--- a/scripts/update_single_machine.sh
+++ b/scripts/update_single_machine.sh
@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
 
 rsa_key="~/.nixos/secrets/ssh_keys/ansible/ansible.key"
-export NIX_SSHOPTS="-t -i " + rsa_key
+export NIX_SSHOPTS="-t -i $rsa_key"
 
 host=$1
-fqdn="${host}.2li.local"
-nixos-rebuild switch --use-remote-sudo --build-host localhost --target-host $fqdn --flake ".#${host}"
+fqdn="$host.2li.local"
+nixos-rebuild switch --use-remote-sudo --build-host localhost --target-host $fqdn --flake ".#$host"