diff --git a/pkgs/development/ocaml-modules/posix/base.nix b/pkgs/development/ocaml-modules/posix/base.nix
new file mode 100644
index 00000000000..a6fe690ebcc
--- /dev/null
+++ b/pkgs/development/ocaml-modules/posix/base.nix
@@ -0,0 +1,26 @@
+{ lib, buildDunePackage, fetchFromGitHub
+, ctypes, integers
+}:
+
+buildDunePackage rec {
+  pname = "posix-base";
+  version = "2.0.0";
+
+  src = fetchFromGitHub {
+    owner = "savonet";
+    repo = "ocaml-posix";
+    rev = "v${version}";
+    sha256 = "18px8hfqcfy2lk8105ki3hrxxigs44gs046ba0fqda6wzd0hr82b";
+  };
+
+  useDune2 = true;
+
+  propagatedBuildInputs = [ ctypes integers ];
+
+  meta = {
+    homepage = "https://www.liquidsoap.info/ocaml-posix/";
+    description = "Base module for the posix bindings";
+    license = lib.licenses.mit;
+    maintainers = [ lib.maintainers.vbgl ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 2ebfc3fff9f..4878266ac83 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -754,6 +754,8 @@ let
 
     piqi-ocaml = callPackage ../development/ocaml-modules/piqi-ocaml { };
 
+    posix-base = callPackage ../development/ocaml-modules/posix/base.nix { };
+
     ppxfind = callPackage ../development/ocaml-modules/ppxfind { };
 
     ppxlib = callPackage ../development/ocaml-modules/ppxlib { };