diff --git a/pkgs/by-name/hi/highscore-prosystem/package.nix b/pkgs/by-name/hi/highscore-prosystem/package.nix
new file mode 100644
index 000000000000..278d6b4d670e
--- /dev/null
+++ b/pkgs/by-name/hi/highscore-prosystem/package.nix
@@ -0,0 +1,51 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitLab,
+  meson,
+  ninja,
+  pkg-config,
+  libhighscore,
+  unstableGitUpdater,
+}:
+
+stdenv.mkDerivation (finalAttrs: {
+  pname = "highscore-prosystem";
+  version = "0-unstable-2025-12-27";
+
+  src = fetchFromGitLab {
+    owner = "highscore-emu";
+    repo = "prosystem";
+    rev = "44d86957d9377fdc1650c8cdaafbf7e2e2671827";
+    hash = "sha256-vxgh819XwI6rjoI7WwUEPx0PVpb58+MIOhCINQKom0Q=";
+  };
+
+  sourceRoot = "${finalAttrs.src.name}/highscore";
+
+  postPatch = ''
+    substituteInPlace meson.build \
+      --replace-fail "run_command('git', 'describe', '--always', '--dirty', '--match', ''', check: false).stdout().strip()" \
+        "'${finalAttrs.src.rev}'"
+  '';
+
+  nativeBuildInputs = [
+    meson
+    ninja
+    pkg-config
+  ];
+
+  buildInputs = [
+    libhighscore
+  ];
+
+  passthru.updateScript = unstableGitUpdater {
+    hardcodeZeroVersion = true;
+  };
+
+  meta = {
+    description = "Port of ProSystem to Highscore";
+    homepage = "https://gitlab.com/highscore-emu/prosystem";
+    license = lib.licenses.gpl2Plus;
+    inherit (libhighscore.meta) maintainers platforms;
+  };
+})