diff --git a/machine-confs/helium.nix b/machine-confs/helium.nix
index 7affb4e..e5b7297 100644
--- a/machine-confs/helium.nix
+++ b/machine-confs/helium.nix
@@ -20,6 +20,7 @@
         peers = [
           {
             publicKey = "f9QoYPxyaxylUcOI9cE9fE9DJoEX4c6GUtr4p+rsd34=";
+            presharedKeyFile = "/root/wireguard-keys/psk-home";
             allowedIPs = [
               "fd08:d473:bcca::/64"
               "fd08:d473:bcca:f0::/64"
diff --git a/machine-confs/lithium.nix b/machine-confs/lithium.nix
index 74d55ad..0e55e22 100644
--- a/machine-confs/lithium.nix
+++ b/machine-confs/lithium.nix
@@ -20,6 +20,7 @@
         peers = [
           {
             publicKey = "f9QoYPxyaxylUcOI9cE9fE9DJoEX4c6GUtr4p+rsd34=";
+            presharedKeyFile = "/root/wireguard-keys/psk-home";
             allowedIPs = [
               "fd08:d473:bcca::/64"
               "fd08:d473:bcca:f0::/64"