diff --git a/hosts/ayanami/configuration.nix b/hosts/ayanami/configuration.nix
index 63582c5..cea4b39 100644
--- a/hosts/ayanami/configuration.nix
+++ b/hosts/ayanami/configuration.nix
@@ -205,7 +205,7 @@
   nix.settings.trusted-users = [ "daniel" ];
 
   nix.buildMachines = [
-    { hostname = "soryu";
+    { hostName = "soryu";
       system = "x86_64-linux";
       maxJobs = 16;
       supportedFeatures = [ "big-parallel" ];
diff --git a/hosts/common/builder.nix b/hosts/common/builder.nix
index bd87491..cf1e0ec 100644
--- a/hosts/common/builder.nix
+++ b/hosts/common/builder.nix
@@ -2,6 +2,7 @@
 
 {
   users.users.nixbuilder = {
+    group = "nixbuilder";
     isSystemUser = true;
     useDefaultShell = true;
     openssh.authorizedKeys.keys = [
@@ -9,6 +10,8 @@
     ];
   };
 
+  users.groups.nixbuilder = {};
+
   nix.settings.trusted-users = [ "nixbuilder" ];
 
   boot.binfmt.emulatedSystems = [ "aarch64-linux" ];