diff --git a/pkgs/os-specific/darwin/reattach-to-user-namespace/default.nix b/pkgs/os-specific/darwin/reattach-to-user-namespace/default.nix
new file mode 100644
index 000000000000..0460c516d297
--- /dev/null
+++ b/pkgs/os-specific/darwin/reattach-to-user-namespace/default.nix
@@ -0,0 +1,16 @@
+{ stdenv, fetchgit }:
+
+stdenv.mkDerivation {
+  name = "reattach-to-user-namespace-2.4";
+  src = fetchgit {
+    url = "https://github.com/ChrisJohnsen/tmux-MacOSX-pasteboard.git";
+    sha256 = "1f9q1wxq764zidnx5hbdkbbyxxzfih0l0cjpgr0pxzwbmd2q6cvv";
+    rev = "2765aeab8f337c29e260a912bf4267a2732d8640";
+  };
+  buildFlags = "ARCHES=x86_64";
+  installPhase = ''
+    mkdir -p $out/bin
+    cp reattach-to-user-namespace $out/bin/
+  '';
+}
+
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index d6737cbc4ddc..83edf273f82e 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -665,6 +665,8 @@ let
   derez = callPackage ../os-specific/darwin/derez { };
   rez = callPackage ../os-specific/darwin/rez { };
 
+  reattach-to-user-namespace = callPackage ../os-specific/darwin/reattach-to-user-namespace {};
+
   setfile = callPackage ../os-specific/darwin/setfile { };
 
   install_name_tool = callPackage ../os-specific/darwin/install_name_tool { };