diff --git a/pkgs/development/ocaml-modules/coin/default.nix b/pkgs/development/ocaml-modules/coin/default.nix
new file mode 100644
index 000000000000..09fe7955c39e
--- /dev/null
+++ b/pkgs/development/ocaml-modules/coin/default.nix
@@ -0,0 +1,38 @@
+{ buildDunePackage
+, fetchzip
+, findlib
+, lib
+, menhir
+, ocaml
+, re
+}:
+
+buildDunePackage rec {
+  pname = "coin";
+  version = "0.1.3";
+  minimalOCamlVersion = "4.03";
+
+  src = fetchzip {
+    url = "https://github.com/mirage/coin/releases/download/v${version}/coin-v${version}.tbz";
+    sha256 = "06bfidvglyp9hzvr2xwbdx8wf26is2xrzc31fldzjf5ab0vd076p";
+  };
+
+  postPatch = ''
+    substituteInPlace src/dune --replace 'ocaml} ' \
+      'ocaml} -I ${findlib}/lib/ocaml/${ocaml.version}/site-lib '
+  '';
+
+  useDune2 = true;
+
+  nativeBuildInputs = [ menhir ];
+
+  checkInputs = [ re ];
+  doCheck = true;
+
+  meta = {
+    description = "A library to normalize an KOI8-{U,R} input to Unicode";
+    license = lib.licenses.mit;
+    homepage = "https://github.com/mirage/coin";
+    maintainers = with lib.maintainers; [ superherointj ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index f225afd14d76..5d2746c44f43 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -195,6 +195,8 @@ let
 
     conduit-mirage = callPackage ../development/ocaml-modules/conduit/mirage.nix { };
 
+    coin =  callPackage ../development/ocaml-modules/coin { };
+
     config-file = callPackage ../development/ocaml-modules/config-file { };
 
     containers = callPackage ../development/ocaml-modules/containers { };