diff --git a/pkgs/by-name/un/unison-fsmonitor/package.nix b/pkgs/by-name/un/unison-fsmonitor/package.nix
new file mode 100644
index 000000000000..6cc8913d3982
--- /dev/null
+++ b/pkgs/by-name/un/unison-fsmonitor/package.nix
@@ -0,0 +1,37 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, rustPlatform
+, darwin
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "unison-fsmonitor";
+  version = "0.3.3";
+
+  src = fetchFromGitHub {
+    owner = "autozimu";
+    repo = "unison-fsmonitor";
+    rev = "v${version}";
+    hash = "sha256-JA0WcHHDNuQOal/Zy3yDb+O3acZN3rVX1hh0rOtRR+8=";
+  };
+  cargoHash = "sha256-aqAa0F1NSJI1nckTjG5C7VLxaLjJgD+9yK/IpclSMqs=";
+
+  buildInputs = lib.optionals stdenv.isDarwin [
+    darwin.apple_sdk.frameworks.CoreServices
+  ];
+
+  checkFlags = [
+    # accesses /usr/bin/env
+    "--skip=test_follow_link"
+  ];
+
+  meta = {
+    homepage = "https://github.com/autozimu/unison-fsmonitor";
+    description = "fsmonitor implementation for darwin";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ nevivurn ];
+    platforms = lib.platforms.darwin;
+    mainProgram = "unison-fsmonitor";
+  };
+}