diff --git a/nixbld-etc-nixos/rt.nix b/nixbld-etc-nixos/rt.nix
index 2bd3eb3..554406c 100644
--- a/nixbld-etc-nixos/rt.nix
+++ b/nixbld-etc-nixos/rt.nix
@@ -300,6 +300,7 @@ in {
 
     users.users.rt = {
       isSystemUser = true;
+      group = "rt";
     };
     users.groups.rt = {};