diff --git a/pkgs/development/ocaml-modules/bls12-381-hash/default.nix b/pkgs/development/ocaml-modules/bls12-381-hash/default.nix
new file mode 100644
index 00000000000..1b39439c747
--- /dev/null
+++ b/pkgs/development/ocaml-modules/bls12-381-hash/default.nix
@@ -0,0 +1,27 @@
+{ lib
+, fetchFromGitLab
+, buildDunePackage
+, bls12-381
+}:
+
+buildDunePackage rec {
+  pname = "bls12-381-hash";
+  version = "1.0.0";
+  src = fetchFromGitLab {
+    owner = "nomadic-labs";
+    repo = "cryptography/ocaml-bls12-381-hash";
+    rev = "${version}";
+    sha256 = "sha256-cfsSVmN4rbKcLcPcy6NduZktJhPXiVdK75LypmaSe9I=";
+  };
+
+  duneVersion = "3";
+
+  propagatedBuildInputs = [ bls12-381 ];
+
+  meta = {
+    description = "Implementation of some cryptographic hash primitives using the scalar field of BLS12-381";
+    license = lib.licenses.mit;
+    homepage = "https://gitlab.com/nomadic-labs/privacy-team";
+    maintainers = [ lib.maintainers.ulrikstrid ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 9026345d35c..e5fb318a1de 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -104,7 +104,8 @@ let
 
     bls12-381 = callPackage ../development/ocaml-modules/bls12-381 { };
     bls12-381-gen = callPackage ../development/ocaml-modules/bls12-381/gen.nix { };
-    bls12-381-legacy = callPackage ../development/ocaml-modules/bls12-381/legacy.nix { };
+
+    bls12-381-hash = callPackage ../development/ocaml-modules/bls12-381-hash { };
 
     bls12-381-signature = callPackage ../development/ocaml-modules/bls12-381-signature { };