diff --git a/pkgs/development/python-modules/aionut/default.nix b/pkgs/development/python-modules/aionut/default.nix
index 96612ea064d4..cfcefeb33028 100644
--- a/pkgs/development/python-modules/aionut/default.nix
+++ b/pkgs/development/python-modules/aionut/default.nix
@@ -27,7 +27,7 @@ buildPythonPackage rec {
       --replace-fail " --cov=aionut --cov-report=term-missing:skip-covered" ""
   '';
 
-  nativeBuildInputs = [ poetry-core ];
+  build-system = [ poetry-core ];
 
   nativeCheckInputs = [
     pytest-asyncio