diff --git a/pkgs/by-name/ar/argp-standalone/package.nix b/pkgs/by-name/ar/argp-standalone/package.nix
index 470d33de7454..a0aacd8ca60b 100644
--- a/pkgs/by-name/ar/argp-standalone/package.nix
+++ b/pkgs/by-name/ar/argp-standalone/package.nix
@@ -26,6 +26,8 @@ stdenv.mkDerivation (finalAttrs: {
 
   doCheck = true;
 
+  __structuredAttrs = true;
+
   meta = {
     homepage = "https://github.com/argp-standalone/argp-standalone";
     description = "Standalone version of arguments parsing functions from Glibc";