diff --git a/modules/nix-cache/client.nix b/modules/nix-cache/client.nix
index a1b2009..54cd08b 100644
--- a/modules/nix-cache/client.nix
+++ b/modules/nix-cache/client.nix
@@ -3,7 +3,7 @@
 {
   nix.settings = {
     substituters = [
-      "http://${vars.nixCacheHost}"
+      "http://${vars.nixCacheHost}.${vars.homeDomain}"
       "https://cache.nixos.org/"
     ];
     trusted-public-keys = [
diff --git a/modules/nix-cache/remote-builder-client.nix b/modules/nix-cache/remote-builder-client.nix
index e705c74..c4b6f9c 100644
--- a/modules/nix-cache/remote-builder-client.nix
+++ b/modules/nix-cache/remote-builder-client.nix
@@ -8,12 +8,12 @@
   # dedicated keypair). If this host doesn't have one yet:
   #   sudo -u root ssh-keygen -t ed25519 -N '' -f /root/.ssh/id_ed25519
   #   # then add its .pub to vars.remoteBuilderAuthorizedKeys and rebuild nix-cache
-  #   sudo ssh -i /root/.ssh/id_ed25519 nixremote@nix-cache nix-store --version
+  #   sudo ssh -i /root/.ssh/id_ed25519 nixremote@nix-cache.sweet.home nix-store --version
   # Trust nix-cache's SSH host key declaratively so the nix-daemon (root)
   # can connect the first time without a manual ssh-keyscan/known_hosts
   # step on every new client.
-  programs.ssh.knownHosts.${vars.nixCacheHost} = {
-    hostNames = [ vars.nixCacheHost ];
+  programs.ssh.knownHosts."${vars.nixCacheHost}.${vars.homeDomain}" = {
+    hostNames = [ "${vars.nixCacheHost}.${vars.homeDomain}" ];
     publicKey = vars.nixCacheHostKey;
   };
 
@@ -22,7 +22,7 @@
 
     buildMachines = [
       {
-        hostName = vars.nixCacheHost;
+        hostName = "${vars.nixCacheHost}.${vars.homeDomain}";
         sshUser = vars.remoteBuilderUser;
         sshKey = "/root/.ssh/id_ed25519";
         inherit (pkgs.stdenv.hostPlatform) system;
diff --git a/modules/nix-cache/server.nix b/modules/nix-cache/server.nix
index cd9c716..6c72b40 100644
--- a/modules/nix-cache/server.nix
+++ b/modules/nix-cache/server.nix
@@ -20,7 +20,7 @@
     nginx = {
       enable = true;
       recommendedProxySettings = true;
-      virtualHosts.${vars.nixCacheHost} = {
+      virtualHosts."${vars.nixCacheHost}.${vars.homeDomain}" = {
         locations."/" = {
           proxyPass = "http://${config.services.nix-serve.bindAddress}:${toString config.services.nix-serve.port}";
         };