diff --git a/pkgs/development/python-modules/rustworkx/default.nix b/pkgs/development/python-modules/rustworkx/default.nix
index d13adc7123db..714c29ea781d 100644
--- a/pkgs/development/python-modules/rustworkx/default.nix
+++ b/pkgs/development/python-modules/rustworkx/default.nix
@@ -1,4 +1,5 @@
 {
+  lib,
   fetchFromGitHub,
   buildPythonPackage,
   cargo,
@@ -10,9 +11,6 @@
   fixtures,
   networkx,
   testtools,
-  libiconv,
-  stdenv,
-  lib,
   pytestCheckHook,
 }:
 
@@ -44,7 +42,7 @@ buildPythonPackage rec {
     setuptools-rust
   ];
 
-  buildInputs = [ numpy ] ++ lib.optionals stdenv.hostPlatform.isDarwin [ libiconv ];
+  dependencies = [ numpy ];
 
   nativeCheckInputs = [
     fixtures