diff --git a/pkgs/development/python-modules/extract-msg/default.nix b/pkgs/development/python-modules/extract-msg/default.nix
index 592172fc3d25..98b51e062770 100644
--- a/pkgs/development/python-modules/extract-msg/default.nix
+++ b/pkgs/development/python-modules/extract-msg/default.nix
@@ -33,12 +33,12 @@ buildPythonPackage rec {
     "red-black-tree-mod"
   ];
 
-  nativeBuildInputs = [
+  build-system = [
     pythonRelaxDepsHook
     setuptools
   ];
 
-  propagatedBuildInputs = [
+  dependencies = [
     beautifulsoup4
     compressed-rtf
     ebcdic