diff --git a/pkgs/development/ocaml-modules/httpaf/lwt-unix.nix b/pkgs/development/ocaml-modules/httpaf/lwt-unix.nix
new file mode 100644
index 00000000000..9b78d7bf640
--- /dev/null
+++ b/pkgs/development/ocaml-modules/httpaf/lwt-unix.nix
@@ -0,0 +1,22 @@
+{ lib, buildDunePackage
+, httpaf
+, faraday-lwt-unix
+, lwt
+}:
+
+buildDunePackage {
+  pname = "httpaf-lwt-unix";
+  inherit (httpaf) version src;
+  duneVersion = "3";
+  minimalOCamlVersion = "4.08";
+
+  propagatedBuildInputs = [
+    faraday-lwt-unix
+    httpaf
+    lwt
+  ];
+
+  meta = httpaf.meta // {
+    description = "Lwt support for http/af";
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 20bd8520cd8..88500959422 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -610,6 +610,8 @@ let
 
     httpaf = callPackage ../development/ocaml-modules/httpaf { };
 
+    httpaf-lwt-unix = callPackage ../development/ocaml-modules/httpaf/lwt-unix.nix { };
+
     index = callPackage ../development/ocaml-modules/index { };
 
     inifiles = callPackage ../development/ocaml-modules/inifiles { };