diff --git a/pkgs/development/python-modules/objgraph/default.nix b/pkgs/development/python-modules/objgraph/default.nix
index 36017bb2e1e8..231c14e4ceff 100644
--- a/pkgs/development/python-modules/objgraph/default.nix
+++ b/pkgs/development/python-modules/objgraph/default.nix
@@ -8,12 +8,13 @@
   python,
   pythonOlder,
   substituteAll,
+  setuptools,
 }:
 
 buildPythonPackage rec {
   pname = "objgraph";
   version = "3.6.1";
-  format = "setuptools";
+  pyproject = true;
 
   disabled = pythonOlder "3.7" || isPyPy;
 
@@ -29,6 +30,10 @@ buildPythonPackage rec {
     })
   ];
 
+  build-system = [
+    setuptools
+  ];
+
   passthru.optional-dependencies = {
     ipython = [ graphviz ];
   };