diff --git a/shell.nix b/shell.nix
index c0c1627..e395e8a 100644
--- a/shell.nix
+++ b/shell.nix
@@ -8,6 +8,7 @@ pkgs.mkShell {
     pkgs.rustfmt
     pkgs.clippy
     pkgs.rust-analyzer
+    pkgs.gnumake
   ];
   shellHook = ''
     echo "[shell.nix] Legacy shell for Rust dev. Use 'nix develop' for full flake support."