diff --git a/pkgs/development/python-modules/demjson3/default.nix b/pkgs/development/python-modules/demjson3/default.nix
index 6171bc3281c8..d365f9e95a2c 100644
--- a/pkgs/development/python-modules/demjson3/default.nix
+++ b/pkgs/development/python-modules/demjson3/default.nix
@@ -10,6 +10,8 @@ buildPythonPackage (finalAttrs: {
   version = "3.0.6";
   format = "setuptools";
 
+  __structuredAttrs = true;
+
   src = fetchPypi {
     inherit (finalAttrs) pname version;
     hash = "sha256-N8g7DG6wjSXe/IjfCipIddWKeAmpZQvW7uev2AU826w=";