diff --git a/nvflare/fuel/utils/fobs/fobs.py b/nvflare/fuel/utils/fobs/fobs.py
index 17b4f3427f..ff49a1bc54 100644
--- a/nvflare/fuel/utils/fobs/fobs.py
+++ b/nvflare/fuel/utils/fobs/fobs.py
@@ -106,8 +106,8 @@ def register(decomposer: Union[Decomposer, Type[Decomposer]]) -> None:
 class Packer:
     def __init__(self, manager: DatumManager):
         self.manager = manager
-        self.enum_decomposer_name = _get_type_name(type(EnumTypeDecomposer))
-        self.data_decomposer_name = _get_type_name(type(DataClassDecomposer))
+        self.enum_decomposer_name = _get_type_name(EnumTypeDecomposer)
+        self.data_decomposer_name = _get_type_name(DataClassDecomposer)
 
     def pack(self, obj: Any) -> dict: