diff --git a/pkgs/development/ocaml-modules/janestreet/core_bench.nix b/pkgs/development/ocaml-modules/janestreet/core_bench.nix
new file mode 100644
index 000000000000..83e6100f0597
--- /dev/null
+++ b/pkgs/development/ocaml-modules/janestreet/core_bench.nix
@@ -0,0 +1,20 @@
+{ stdenv
+, buildOcamlJane
+, core
+, core_extended
+, textutils
+}:
+
+buildOcamlJane rec {
+  name = "core_bench";
+  hash = "1d1ainpakgsf5rg8dvar12ksgilqcc4465jr8gf7fz5mmn0mlifj";
+  propagatedBuildInputs =
+    [ core core_extended textutils ];
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/janestreet/core_bench;
+    description = "Micro-benchmarking library for OCaml";
+    license = licenses.asl20;
+    maintainers = [ maintainers.pmahoney ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 3a185bc0a10b..13ece3dec43f 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -728,6 +728,9 @@ let
       then callPackage ../development/ocaml-modules/janestreet/bin_prot.nix {}
       else bin_prot_p4;
 
+    core_bench =
+      callPackage ../development/ocaml-modules/janestreet/core_bench.nix {};
+
     core_kernel =
       if lib.versionOlder "4.03" ocaml.version
       then callPackage ../development/ocaml-modules/janestreet/core_kernel-113_33_01.nix {}