diff --git a/src/diffusers/utils/outputs.py b/src/diffusers/utils/outputs.py
index 6080a86b871a..c625746cf8a9 100644
--- a/src/diffusers/utils/outputs.py
+++ b/src/diffusers/utils/outputs.py
@@ -71,6 +71,7 @@ def __init_subclass__(cls) -> None:
                     cls,
                     torch.utils._pytree._dict_flatten,
                     lambda values, context: cls(**torch.utils._pytree._dict_unflatten(values, context)),
+                    serialized_type_name=f"{cls.__module__}.{cls.__name__}",
                 )
 
     def __post_init__(self) -> None: