diff --git a/pkgs/development/python-modules/pyschlage/default.nix b/pkgs/development/python-modules/pyschlage/default.nix
index 44d3e1d4c512..d039364f6928 100644
--- a/pkgs/development/python-modules/pyschlage/default.nix
+++ b/pkgs/development/python-modules/pyschlage/default.nix
@@ -12,7 +12,7 @@
 buildPythonPackage rec {
   pname = "pyschlage";
   version = "2024.2.0";
-  format = "pyproject";
+  pyproject = true;
 
   disabled = pythonOlder "3.7";