diff --git a/pkgs/development/ocaml-modules/fiber/default.nix b/pkgs/development/ocaml-modules/fiber/default.nix
new file mode 100644
index 000000000000..fe805c82a350
--- /dev/null
+++ b/pkgs/development/ocaml-modules/fiber/default.nix
@@ -0,0 +1,23 @@
+{ lib, buildDunePackage, dune_3, stdune, dyn }:
+
+buildDunePackage rec {
+  pname = "fiber";
+  inherit (dune_3) src version;
+
+  duneVersion = "3";
+
+  dontAddPrefix = true;
+
+  buildInputs = [ stdune dyn ];
+
+  preBuild = ''
+    rm -r vendor/csexp
+  '';
+
+  meta = with lib; {
+    description = "Structured concurrency library";
+    inherit (dune_3.meta) homepage;
+    maintainers = with lib.maintainers; [ ];
+    license = licenses.mit;
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 0762e7f9ad6a..1d2124078aa7 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -419,6 +419,8 @@ let
       inherit (pkgs) ffmpeg;
     };
 
+    fiber = callPackage ../development/ocaml-modules/fiber { };
+
     fileutils = callPackage ../development/ocaml-modules/fileutils { };
 
     findlib = callPackage ../development/tools/ocaml/findlib { };