diff --git a/pkgs/by-name/gn/gnucobol/package.nix b/pkgs/by-name/gn/gnucobol/package.nix
index 70931643a432..2e422c7e571b 100644
--- a/pkgs/by-name/gn/gnucobol/package.nix
+++ b/pkgs/by-name/gn/gnucobol/package.nix
@@ -32,6 +32,7 @@ stdenv.mkDerivation (finalAttrs: {
   pname = "gnucobol";
   version = "3.2";
 
+  __structuredAttrs = true;
   strictDeps = true;
 
   src = fetchurl {