diff --git a/pkgs/development/python-modules/cmsdials/default.nix b/pkgs/development/python-modules/cmsdials/default.nix
index eaf436af2eeda8..23712b7c474bce 100644
--- a/pkgs/development/python-modules/cmsdials/default.nix
+++ b/pkgs/development/python-modules/cmsdials/default.nix
@@ -11,6 +11,8 @@
 }:
 
 buildPythonPackage rec {
+  __structuredAttrs = true;
+
   pname = "cmsdials";
   version = "1.3.0";
   pyproject = true;