diff --git a/pkgs/development/ocaml-modules/pa_ounit/default.nix b/pkgs/development/ocaml-modules/pa_ounit/default.nix
new file mode 100644
index 00000000000..5970aba1e50
--- /dev/null
+++ b/pkgs/development/ocaml-modules/pa_ounit/default.nix
@@ -0,0 +1,20 @@
+{stdenv, buildOcaml, fetchurl, ounit}:
+
+buildOcaml rec {
+  name = "pa_ounit";
+  version = "112.24.00";
+
+  src = fetchurl {
+    url = "https://github.com/janestreet/pa_ounit/archive/${version}.tar.gz";
+    sha256 = "fa04e72fe1db41e6dc64f9707cf5705cb9b957aa93265120c875c808eb9b9b96";
+  };
+
+  propagatedBuildInputs = [ ounit ];
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/janestreet/pa_ounit;
+    description = "OCaml inline testing";
+    license = licenses.asl20;
+    maintainers = [ maintainers.ericbmerritt ];
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 058a5a49c57..2bd61bddef8 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -4325,6 +4325,8 @@ let
 
     ocurl = callPackage ../development/ocaml-modules/ocurl { };
 
+    pa_ounit = callPackage ../development/ocaml-modules/pa_ounit { };
+
     pprint = callPackage ../development/ocaml-modules/pprint { };
 
     pycaml = callPackage ../development/ocaml-modules/pycaml { };