diff --git a/pkgs/by-name/gn/gnum4/package.nix b/pkgs/by-name/gn/gnum4/package.nix
index 73c5be0ac04e..78e02d2698fa 100644
--- a/pkgs/by-name/gn/gnum4/package.nix
+++ b/pkgs/by-name/gn/gnum4/package.nix
@@ -47,6 +47,8 @@ stdenv.mkDerivation (finalAttrs: {
   ]
   ++ lib.optional stdenv.hostPlatform.isMinGW "CFLAGS=-fno-stack-protector";
 
+  __structuredAttrs = true;
+
   meta = {
     description = "GNU M4, a macro processor";
     longDescription = ''