diff --git a/ocaml-pkgs/ubase.nix b/ocaml-pkgs/ubase.nix
new file mode 100644
index 0000000..d873952
--- /dev/null
+++ b/ocaml-pkgs/ubase.nix
@@ -0,0 +1,36 @@
+{
+  lib,
+  buildDunePackage,
+  fetchFromGitHub,
+}:
+
+buildDunePackage rec {
+  pname = "ubase";
+  version = "0.20";
+
+  minimalOCamlVersion = "4.14";
+  duneVersion = "3";
+
+  src = fetchFromGitHub {
+    owner = "sanette";
+    repo = "ubase";
+    rev = version;
+    hash = "sha256-zmYjWEk0r1h87RczCJu2tYlS79F/pAiBt16BplPmA7c=";
+  };
+
+  propagatedBuildInputs = [ ];
+
+  doCheck = true;
+  checkInputs = [
+  ];
+
+  meta = {
+    description = "Remove accents from utf8 strings";
+    homepage = "https://github.com/sanette/ubase";
+    changelog = "https://github.com/sanette/ubase/blob/${src.rev}/CHANGES.md";
+    license = lib.licenses.lgpl3;
+    maintainers = with lib.maintainers; [ ];
+    mainProgram = "ubase";
+    platforms = lib.platforms.all;
+  };
+}
diff --git a/overlay.nix b/overlay.nix
index e6af158..c9c92e7 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -17,4 +17,8 @@ mkGeneralOverlay ./pkgs final prev
     xml = import ./xml.nix { pkgs = final; };
   };
   pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [ (mkGeneralOverlay ./python-pkgs) ];
+  # ocamlPackagesExtensions is from a custom patch
+  ocamlPackagesExtensions = (prev.ocamlPackagesExtensions or [ ]) ++ [
+    (mkGeneralOverlay ./ocaml-pkgs)
+  ];
 }