diff --git a/pkgs/development/ocaml-modules/duppy/default.nix b/pkgs/development/ocaml-modules/duppy/default.nix
new file mode 100644
index 000000000000..48d360deb23f
--- /dev/null
+++ b/pkgs/development/ocaml-modules/duppy/default.nix
@@ -0,0 +1,22 @@
+{ lib, buildDunePackage, fetchFromGitHub, ocaml_pcre }:
+
+buildDunePackage rec {
+  pname = "duppy";
+  version = "0.9.2";
+
+  src = fetchFromGitHub {
+    owner = "savonet";
+    repo = "ocaml-duppy";
+    rev = "v${version}";
+    sha256 = "132dawca1p5s965m40ldmnihlpgfm47y62kfbzgim7sgsdwxxw5y";
+  };
+
+  propagatedBuildInputs = [ ocaml_pcre ];
+
+  meta = with lib; {
+    homepage = "https://github.com/savonet/ocaml-duppy";
+    description = "Library providing monadic threads";
+    license = licenses.lgpl21Only;
+    maintainers = with maintainers; [ dandellion ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index d29086f8aba1..2a942bebb0a6 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -349,6 +349,8 @@ let
 
     dune-site = callPackage ../development/ocaml-modules/dune-site { };
 
+    duppy = callPackage ../development/ocaml-modules/duppy { };
+
     duration =  callPackage ../development/ocaml-modules/duration { };
 
     dyn =  callPackage ../development/ocaml-modules/dyn { };