diff --git a/pkgs/by-name/i3/i3altlayout/package.nix b/pkgs/by-name/i3/i3altlayout/package.nix
index d9af049b0a53..ef080a0da547 100644
--- a/pkgs/by-name/i3/i3altlayout/package.nix
+++ b/pkgs/by-name/i3/i3altlayout/package.nix
@@ -7,13 +7,19 @@
 python3Packages.buildPythonApplication (finalAttrs: {
   pname = "i3altlayout";
   version = "0.3";
-  format = "setuptools";
+  pyproject = true;
+
+  __structuredAttrs = true;
 
   src = fetchPypi {
     inherit (finalAttrs) pname version;
     hash = "sha256-DhOYeSCxKthr2fEMGMBXjUYeCJjj6AV4d05So4eDF8A=";
   };
 
+  build-system = with python3Packages; [
+    setuptools
+  ];
+
   pythonRemoveDeps = [ "enum-compat" ];
 
   pythonPath = with python3Packages; [