diff --git a/pkgs/development/ocaml-modules/janestreet/ppx-let.nix b/pkgs/development/ocaml-modules/janestreet/ppx-let.nix
new file mode 100644
index 000000000000..3498affeb090
--- /dev/null
+++ b/pkgs/development/ocaml-modules/janestreet/ppx-let.nix
@@ -0,0 +1,14 @@
+{stdenv, buildOcamlJane,
+ ppx_core, ppx_driver}:
+
+buildOcamlJane rec {
+  name = "ppx_let";
+  hash = "0whnfq4rgkq4apfqnvc100wlk25pmqdyvy6s21dsn3fcm9hff467";
+  propagatedBuildInputs = [ ppx_core ppx_driver ];
+
+  meta = with stdenv.lib; {
+    description = "A ppx rewriter for monadic and applicative let bindings and match statements";
+    maintainers = [ maintainers.maurer ];
+    license = licenses.asl20;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 6f7a05618656..80607f5c5637 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -5541,6 +5541,8 @@ in
     ppx_fail = callPackage ../development/ocaml-modules/janestreet/ppx-fail.nix {};
 
     ppx_fields_conv = callPackage ../development/ocaml-modules/janestreet/ppx-fields-conv.nix {};
+
+    ppx_let = callPackage ../development/ocaml-modules/janestreet/ppx-let.nix {};
   };
 
   ocamlPackages = recurseIntoAttrs ocamlPackages_4_01_0;