diff --git a/pkgs/development/python-modules/numericalunits/default.nix b/pkgs/development/python-modules/numericalunits/default.nix
index 12d91d726672..df2e5c6402af 100644
--- a/pkgs/development/python-modules/numericalunits/default.nix
+++ b/pkgs/development/python-modules/numericalunits/default.nix
@@ -12,8 +12,6 @@ buildPythonPackage (finalAttrs: {
   version = "1.28";
   pyproject = true;
 
-  __structuredAttrs = true;
-
   src = fetchFromGitHub {
     owner = "sbyrnes321";
     repo = "numericalunits";