diff --git a/pkgs/development/python-modules/flask-marshmallow/default.nix b/pkgs/development/python-modules/flask-marshmallow/default.nix
index 6c256c496835..68ce1cd451ed 100644
--- a/pkgs/development/python-modules/flask-marshmallow/default.nix
+++ b/pkgs/development/python-modules/flask-marshmallow/default.nix
@@ -25,9 +25,9 @@ buildPythonPackage rec {
     hash = "sha256-GQLkt/CJf/QI8emvlW8xSRziGnncwfMSxBccW0Bb8I0=";
   };
 
-  nativeBuildInputs = [ flit-core ];
+  build-system = [ flit-core ];
 
-  propagatedBuildInputs = [
+  dependencies = [
     flask
     marshmallow
   ];