diff --git a/flake.nix b/flake.nix
index 5019d36..77402c3 100644
--- a/flake.nix
+++ b/flake.nix
@@ -39,7 +39,7 @@
               1;
 
             src = lib.cleanSource ./.;
-            format = "pyproject";
+            pyproject = true;
             nativeBuildInputs = with pkgs.python311Packages; [
               setuptools-scm
             ];