diff --git a/pkgs/development/python-modules/bcrypt/default.nix b/pkgs/development/python-modules/bcrypt/default.nix
index 051879c2ac1f..a4848c676a94 100644
--- a/pkgs/development/python-modules/bcrypt/default.nix
+++ b/pkgs/development/python-modules/bcrypt/default.nix
@@ -8,6 +8,8 @@
 , pythonOlder
 , cffi
 , pytestCheckHook
+, libiconv
+, stdenv
   # for passthru.tests
 , asyncssh
 , django_4
@@ -45,6 +47,9 @@ buildPythonPackage rec {
     rust.rustc
   ]);
 
+  # Remove when https://github.com/NixOS/nixpkgs/pull/190093 lands.
+  buildInputs = lib.optional stdenv.isDarwin libiconv;
+
   propagatedBuildInputs = [
     cffi
   ];