diff --git a/pkgs/development/ocaml-modules/asai/default.nix b/pkgs/development/ocaml-modules/asai/default.nix
new file mode 100644
index 000000000000..b089eba76874
--- /dev/null
+++ b/pkgs/development/ocaml-modules/asai/default.nix
@@ -0,0 +1,35 @@
+{ lib, fetchFromGitHub, buildDunePackage
+, algaeff
+, bwd
+, eio
+, eio_main
+, lsp
+, notty
+}:
+
+buildDunePackage rec {
+  pname = "asai";
+  version = "0.1.1";
+  src = fetchFromGitHub {
+    owner = "RedPRL";
+    repo = pname;
+    rev = version;
+    hash = "sha256-Jd90WhSjK4K2amFA5uyGF57NzsgHA8QiccX6qtxO1rQ=";
+  };
+
+  propagatedBuildInputs = [
+    algaeff
+    bwd
+    lsp
+    eio
+    eio_main
+    notty
+  ];
+
+  meta = {
+    description = "A library for constructing and printing compiler diagnostics";
+    homepage = "https://redprl.org/asai/asai/";
+    license = lib.licenses.asl20;
+    maintainers = [ lib.maintainers.vbgl ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index ae48af74bc0b..872e67262a57 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -40,6 +40,8 @@ let
 
     arp = callPackage ../development/ocaml-modules/arp { };
 
+    asai = callPackage ../development/ocaml-modules/asai { };
+
     asetmap = callPackage ../development/ocaml-modules/asetmap { };
 
     asn1-combinators = callPackage ../development/ocaml-modules/asn1-combinators { };