diff --git a/pkgs/development/python-modules/json-stream/default.nix b/pkgs/development/python-modules/json-stream/default.nix
index 37c72b6abb0e..42cb730492ee 100644
--- a/pkgs/development/python-modules/json-stream/default.nix
+++ b/pkgs/development/python-modules/json-stream/default.nix
@@ -1,6 +1,8 @@
 { lib
+, stdenv
 , buildPythonPackage
 , fetchPypi
+, iconv
 , pytestCheckHook
 , pythonOlder
 , requests
@@ -24,6 +26,10 @@ buildPythonPackage rec {
     setuptools
   ];
 
+  buildInputs = lib.optionals stdenv.isDarwin [
+    iconv
+  ];
+
   propagatedBuildInputs = [
     requests
     json-stream-rs-tokenizer