diff --git a/pkgs/development/ocaml-modules/uchar/default.nix b/pkgs/development/ocaml-modules/uchar/default.nix
new file mode 100644
index 00000000000..c2e5a1fc929
--- /dev/null
+++ b/pkgs/development/ocaml-modules/uchar/default.nix
@@ -0,0 +1,27 @@
+{ stdenv, fetchurl, ocaml, ocamlbuild, opam }:
+
+stdenv.mkDerivation {
+  name = "ocaml${ocaml.version}-uchar-0.0.1";
+
+  src = fetchurl {
+    url = https://github.com/ocaml/uchar/releases/download/v0.0.1/uchar-0.0.1.tbz;
+    sha256 = "0ficw1x7ymbd6m8hqw3w1aycwm1hbwd6bad3c5pspwnzh3qlikhi";
+  };
+
+  unpackCmd = "tar xjf $src";
+  buildInputs = [ ocaml ocamlbuild opam ];
+  buildPhase = "ocaml pkg/build.ml native=true native-dynlink=true";
+  installPhase = ''
+    opam-installer --script --prefix=$out uchar.install > install.sh
+    sh install.sh
+    mkdir -p $out/lib/ocaml/${ocaml.version}/site-lib/
+    ln -s $out/lib/uchar $out/lib/ocaml/${ocaml.version}/site-lib/
+  '';
+
+
+  meta = {
+    description = "Compatibility library for OCaml’s Uchar module";
+    inherit (ocaml.meta) platforms license;
+    maintainers = [ stdenv.lib.maintainers.vbgl ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 223380fcadd..58e9512e31c 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -441,6 +441,8 @@ let
 
     typerep_p4 = callPackage ../development/ocaml-modules/typerep { };
 
+    uchar = callPackage ../development/ocaml-modules/uchar { };
+
     utop = callPackage ../development/tools/ocaml/utop { };
 
     uuidm = callPackage ../development/ocaml-modules/uuidm { };