diff --git a/nixos/modules/services/misc/nix-daemon.nix b/nixos/modules/services/misc/nix-daemon.nix
index c88fceb9a92c..5937ed0219dc 100644
--- a/nixos/modules/services/misc/nix-daemon.nix
+++ b/nixos/modules/services/misc/nix-daemon.nix
@@ -792,7 +792,10 @@ in
         fi
       '';
 
-    nix.nrBuildUsers = mkDefault (max 32 (if cfg.settings.max-jobs == "auto" then 0 else cfg.settings.max-jobs));
+    nix.nrBuildUsers = mkDefault (
+      if cfg.settings.auto-allocate-uids or false then 0
+      else max 32 (if cfg.settings.max-jobs == "auto" then 0 else cfg.settings.max-jobs)
+    );
 
     users.users = nixbldUsers;