diff --git a/pkgs/development/python-modules/libcst/default.nix b/pkgs/development/python-modules/libcst/default.nix
index 86b546289bbe..ccd12e4aaae3 100644
--- a/pkgs/development/python-modules/libcst/default.nix
+++ b/pkgs/development/python-modules/libcst/default.nix
@@ -1,8 +1,10 @@
 { lib
+, stdenv
 , buildPythonPackage
 , dataclasses
 , fetchFromGitHub
 , hypothesis
+, libiconv
 , pytestCheckHook
 , python
 , pythonOlder
@@ -51,6 +53,8 @@ buildPythonPackage rec {
     rustPlatform.cargoSetupHook
   ] ++ (with rustPlatform; [ rust.cargo rust.rustc ]);
 
+  buildInputs = lib.optionals stdenv.isDarwin [ libiconv ];
+
   propagatedBuildInputs = [
     hypothesis
     typing-extensions