diff --git a/pkgs/by-name/mp/mpdecimal/package.nix b/pkgs/by-name/mp/mpdecimal/package.nix
index ca1d0bba4969..0d90dec4f5aa 100644
--- a/pkgs/by-name/mp/mpdecimal/package.nix
+++ b/pkgs/by-name/mp/mpdecimal/package.nix
@@ -22,6 +22,8 @@ stdenv.mkDerivation (finalAttrs: {
 
   nativeBuildInputs = [ autoreconfHook ];
 
+  strictDeps = true;
+
   enableParallelBuilding = true;
 
   postInstall = ''
@@ -32,6 +34,8 @@ stdenv.mkDerivation (finalAttrs: {
     echo -n $cxx >> $dev/nix-support/propagated-build-inputs
   '';
 
+  __structuredAttrs = true;
+
   meta = {
     description = "Library for arbitrary precision decimal floating point arithmetic";