diff --git a/nix-os/nix.nix b/nix-os/nix.nix
index bce75a5..08b1707 100644
--- a/nix-os/nix.nix
+++ b/nix-os/nix.nix
@@ -55,6 +55,7 @@ in {
     environment.systemPackages = [
       pkgs.nix-output-monitor
       pkgs.nix-diff
+      pkgs.nix-tree
     ] ++ lib.map (lib.hiPrio) [
       (wrappedNixExecutables true)
       wrappedNixosExecutables