diff --git a/pkgs/development/python-modules/pydantic-core/default.nix b/pkgs/development/python-modules/pydantic-core/default.nix
index c61a060fd432..7826712acb6e 100644
--- a/pkgs/development/python-modules/pydantic-core/default.nix
+++ b/pkgs/development/python-modules/pydantic-core/default.nix
@@ -1,9 +1,11 @@
-{ lib
+{ stdenv
+, lib
 , buildPythonPackage
 , fetchFromGitHub
 , cargo
 , rustPlatform
 , rustc
+, libiconv
 , typing-extensions
 , pytestCheckHook
 , hypothesis
@@ -40,6 +42,10 @@ buildPythonPackage rec {
     typing-extensions
   ];
 
+  buildInputs = lib.optionals stdenv.isDarwin [
+    libiconv
+  ];
+
   propagatedBuildInputs = [
     typing-extensions
   ];