diff --git a/pkgs/development/compilers/mlkit/default.nix b/pkgs/development/compilers/mlkit/default.nix
index 04e9e8a1630e..eb2866629721 100644
--- a/pkgs/development/compilers/mlkit/default.nix
+++ b/pkgs/development/compilers/mlkit/default.nix
@@ -2,18 +2,18 @@
 
 stdenv.mkDerivation rec {
   pname = "mlkit";
-  version = "4.5.9";
+  version = "4.6.1";
 
   src = fetchFromGitHub {
     owner = "melsman";
     repo = "mlkit";
     rev = "v${version}";
-    sha256 = "sha256-b+iPuGB82a0r0zl49+RbalxR6OpFNXOxZgubzKE+2M4=";
+    sha256 = "sha256-04G9G14fhEh8wwgqHwUR+sbYU3zaZcFV0q5SoAKcyjY=";
   };
 
   nativeBuildInputs = [ autoreconfHook mlton ];
 
-  buildFlags = ["mlkit" "mlkit_libs"];
+  buildFlags = [ "mlkit" "mlkit_libs" ];
 
   meta = with lib; {
     description = "Standard ML Compiler and Toolkit";
diff --git a/pkgs/tools/package-management/smlpkg/default.nix b/pkgs/tools/package-management/smlpkg/default.nix
index f3f7750f1bdd..b92ced4842a0 100644
--- a/pkgs/tools/package-management/smlpkg/default.nix
+++ b/pkgs/tools/package-management/smlpkg/default.nix
@@ -37,6 +37,7 @@ stdenv.mkDerivation rec {
     description = "Generic package manager for Standard ML libraries and programs";
     homepage = "https://github.com/diku-dk/smlpkg";
     license = licenses.mit;
+    platforms = mlton.meta.platforms;
     maintainers = with maintainers; [ athas ];
   };
 }