diff --git a/pkgs/development/ocaml-modules/unstrctrd/default.nix b/pkgs/development/ocaml-modules/unstrctrd/default.nix
new file mode 100644
index 000000000000..eb2ec5480f4d
--- /dev/null
+++ b/pkgs/development/ocaml-modules/unstrctrd/default.nix
@@ -0,0 +1,48 @@
+{ alcotest
+, angstrom
+, bigstringaf
+, buildDunePackage
+, crowbar
+, fetchzip
+, fmt
+, hxd
+, ke
+, lib
+, rresult
+, uutf
+}:
+
+buildDunePackage rec {
+  pname = "unstrctrd";
+  version = "0.3";
+
+  src = fetchzip {
+    url = "https://github.com/dinosaure/unstrctrd/releases/download/v${version}/unstrctrd-v${version}.tbz";
+    sha256 = "0mjm4v7kk75iwwsfnpmxc3bsl8aisz53y7z21sykdp60f4rxnah7";
+  };
+
+  useDune2 = true;
+
+  propagatedBuildInputs = [
+    angstrom
+    uutf
+  ];
+
+  checkInputs = [
+    alcotest
+    bigstringaf
+    crowbar
+    fmt
+    hxd
+    ke
+    rresult
+  ];
+  doCheck = true;
+
+  meta = {
+    description = "A library for parsing email headers";
+    homepage = "https://github.com/dinosaure/unstrctrd";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ superherointj ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 65fe8a9935b3..e298e78515ee 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1361,6 +1361,8 @@ let
 
     stdint = callPackage ../development/ocaml-modules/stdint { };
 
+    unstrctrd = callPackage ../development/ocaml-modules/unstrctrd { };
+
     uucd = callPackage ../development/ocaml-modules/uucd { };
     uucp = callPackage ../development/ocaml-modules/uucp { };
     uunf = callPackage ../development/ocaml-modules/uunf { };