diff --git a/pkgs/development/python-modules/interruptingcow/default.nix b/pkgs/development/python-modules/interruptingcow/default.nix
index cbcd976c5624..4f8cfe01985a 100644
--- a/pkgs/development/python-modules/interruptingcow/default.nix
+++ b/pkgs/development/python-modules/interruptingcow/default.nix
@@ -2,21 +2,28 @@
   lib,
   buildPythonPackage,
   fetchPypi,
+  setuptools,
 }:
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "interruptingcow";
   version = "0.8";
-  format = "setuptools";
+  pyproject = true;
+
+  __structuredAttrs = true;
 
   src = fetchPypi {
-    inherit pname version;
+    inherit (finalAttrs) pname version;
     sha256 = "3e8cd5058b651e625702cba53e3b1fb76d7a5ec07ab69c52a167a9f784e3306c";
   };
 
+  build-system = [
+    setuptools
+  ];
+
   meta = {
     description = "Watchdog that interrupts long running code";
     homepage = "https://bitbucket.org/evzijst/interruptingcow";
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ benley ];
   };
-}
+})