diff --git a/pkgs/development/python-modules/pex/default.nix b/pkgs/development/python-modules/pex/default.nix
index 4022cc7da4dd..7b962064a832 100644
--- a/pkgs/development/python-modules/pex/default.nix
+++ b/pkgs/development/python-modules/pex/default.nix
@@ -17,7 +17,7 @@ buildPythonPackage rec {
     hash = "sha256-fQ/IYjYZL7wUpxslCB6cSMVD19vB57Jw1i7/iK/SJFw=";
   };
 
-  nativeBuildInputs = [
+  build-system = [
     hatchling
   ];