diff --git a/pkgs/development/ocaml-modules/tcslib/default.nix b/pkgs/development/ocaml-modules/tcslib/default.nix
index 4454359d5845..53bc8c9292cb 100644
--- a/pkgs/development/ocaml-modules/tcslib/default.nix
+++ b/pkgs/development/ocaml-modules/tcslib/default.nix
@@ -1,4 +1,4 @@
-{ lib, fetchFromGitHub, ocamlPackages, buildOasisPackage, ounit, extlib, num }:
+{ lib, fetchFromGitHub, ocamlPackages, buildOasisPackage, extlib, num }:
 
 buildOasisPackage rec {
   pname = "tcslib";
@@ -13,7 +13,6 @@ buildOasisPackage rec {
     sha256 = "05g6m82blsccq8wx8knxv6a5fzww7hi624jx91f9h87nk2fsplhi";
   };
 
-  buildInputs = [ ounit ];
   propagatedBuildInputs = [ extlib num ];
 
   meta = {