diff --git a/pkgs/tools/misc/asciinema/default.nix b/pkgs/tools/misc/asciinema/default.nix
index 9f76f7e88a25..08d130513cd9 100644
--- a/pkgs/tools/misc/asciinema/default.nix
+++ b/pkgs/tools/misc/asciinema/default.nix
@@ -1,13 +1,13 @@
-{ lib
-, python3Packages
-, fetchFromGitHub
-, glibcLocales
+{
+  lib,
+  python3Packages,
+  fetchFromGitHub,
 }:
 
 python3Packages.buildPythonApplication rec {
   pname = "asciinema";
   version = "2.4.0";
-  format = "pyproject";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "asciinema";
@@ -16,13 +16,11 @@ python3Packages.buildPythonApplication rec {
     hash = "sha256-UegLwpJ+uc9cW3ozLQJsQBjIGD7+vzzwzQFRV5gmDmI=";
   };
 
-  nativeBuildInputs = [
-    python3Packages.setuptools
-  ];
+  build-system = [ python3Packages.setuptools ];
 
   postPatch = ''
     substituteInPlace tests/pty_test.py \
-      --replace "python3" "${python3Packages.python}/bin/python"
+      --replace-fail "python3" "${python3Packages.python.interpreter}"
   '';
 
   nativeCheckInputs = [ python3Packages.pytestCheckHook ];