diff --git a/pkgs/applications/editors/vscode/extensions/default.nix b/pkgs/applications/editors/vscode/extensions/default.nix
index 5ecb1b7b3233..4572a41247e2 100644
--- a/pkgs/applications/editors/vscode/extensions/default.nix
+++ b/pkgs/applications/editors/vscode/extensions/default.nix
@@ -16,6 +16,7 @@
 , racket
 , clojure-lsp
 , alejandra
+, millet
 }:
 
 let
@@ -311,6 +312,26 @@ let
         };
       };
 
+      azdavis.millet = buildVscodeMarketplaceExtension {
+        mktplcRef = {
+          name = "Millet";
+          publisher = "azdavis";
+          version = "0.3.5";
+          sha256 = "sha256-lQ7EMs6nsTEgP9BESMpyoZG7QVOe7DXzfg/iZr1+DCQ=";
+        };
+        nativeBuildInputs = [ jq moreutils ];
+        postInstall = ''
+          cd "$out/$installPrefix"
+          jq '.contributes.configuration.properties."millet.server.path".default = "${millet}/bin/lang-srv"' package.json | sponge package.json
+        '';
+        meta = with lib; {
+          description = "Standard ML support for VS Code";
+          downloadPage = "https://marketplace.visualstudio.com/items?itemName=azdavis.millet";
+          license = licenses.mit;
+          maintainers = with maintainers; [ smasher164 ];
+        };
+      };
+
       ms-python.vscode-pylance = buildVscodeMarketplaceExtension {
         mktplcRef = {
           name = "vscode-pylance";