diff --git a/pkgs/development/ocaml-modules/cachet/lwt.nix b/pkgs/development/ocaml-modules/cachet/lwt.nix
new file mode 100644
index 000000000000..6f365e5ac09d
--- /dev/null
+++ b/pkgs/development/ocaml-modules/cachet/lwt.nix
@@ -0,0 +1,21 @@
+{
+  buildDunePackage,
+  cachet,
+  lwt,
+  alcotest,
+}:
+
+buildDunePackage {
+  pname = "cachet-lwt";
+  inherit (cachet) src version;
+  propagatedBuildInputs = [
+    cachet
+    lwt
+  ];
+  doCheck = true;
+  checkInputs = [ alcotest ];
+
+  meta = cachet.meta // {
+    description = "A simple cache system for mmap and lwt";
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 41802f6ac19d..0a1d544a9d95 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -163,6 +163,8 @@ let
 
         cachet = callPackage ../development/ocaml-modules/cachet { };
 
+        cachet-lwt = callPackage ../development/ocaml-modules/cachet/lwt.nix { };
+
         cairo2 = callPackage ../development/ocaml-modules/cairo2 { };
 
         calendar = callPackage ../development/ocaml-modules/calendar { };