diff --git a/flake.nix b/flake.nix
index 3b7a0ba..d19ac83 100644
--- a/flake.nix
+++ b/flake.nix
@@ -21,6 +21,7 @@
       {
         devShells.default = pkgs.mkShell {
           packages = with pkgs; [
+            gnumake
             dune_3
             ocaml-pkgs.ocaml
             ocaml-pkgs.ocamlPackages.utop