diff --git a/pkgs/development/ocaml-modules/tcslib/default.nix b/pkgs/development/ocaml-modules/tcslib/default.nix
new file mode 100644
index 00000000000..40481c89937
--- /dev/null
+++ b/pkgs/development/ocaml-modules/tcslib/default.nix
@@ -0,0 +1,25 @@
+{ stdenv, fetchFromGitHub, ocamlPackages, buildOasisPackage }:
+
+buildOasisPackage rec {
+  name = "tcslib";
+  version = "v0.3";
+
+  minimumSupportedOCamlVersion = "4.03.0";
+
+  src = fetchFromGitHub {
+    owner  = "tcsprojects";
+    repo   = "tcslib";
+    rev    = version;
+    sha256 = "05g6m82blsccq8wx8knxv6a5fzww7hi624jx91f9h87nk2fsplhi";
+  };
+
+  buildInputs = with ocamlPackages; [ ounit ];
+  propagatedBuildInputs = with ocamlPackages; [ ocaml_extlib num ];
+
+  meta = {
+    homepage = https://github.com/tcsprojects/tcslib;
+    description = "A multi-purpose library for OCaml";
+    license = stdenv.lib.licenses.bsd3;
+    maintainers = with stdenv.lib.maintainers; [ mgttlinger ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index bac8e411bbd..1ca56235c65 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -721,6 +721,8 @@ let
 
     stringext = callPackage ../development/ocaml-modules/stringext { };
 
+    tcslib = callPackage ../development/ocaml-modules/tcslib { };
+
     toml = callPackage ../development/ocaml-modules/toml { };
 
     topkg = callPackage ../development/ocaml-modules/topkg { };