diff --git a/src/datasets/dataset_dict.py b/src/datasets/dataset_dict.py
index f92a1a8afda..89e054fabcf 100644
--- a/src/datasets/dataset_dict.py
+++ b/src/datasets/dataset_dict.py
@@ -784,6 +784,7 @@ def map(
         function: Optional[Callable] = None,
         with_indices: bool = False,
         with_rank: bool = False,
+        with_split: bool = False,
         input_columns: Optional[Union[str, List[str]]] = None,
         batched: bool = False,
         batch_size: Optional[int] = 1000,
@@ -795,7 +796,7 @@ def map(
         writer_batch_size: Optional[int] = 1000,
         features: Optional[Features] = None,
         disable_nullable: bool = False,
-        fn_kwargs: Optional[dict] = None,
+        fn_kwargs: dict = {},
         num_proc: Optional[int] = None,
         desc: Optional[str] = None,
     ) -> "DatasetDict":
@@ -882,6 +883,7 @@ def map(
         self._check_values_type()
         if cache_file_names is None:
             cache_file_names = {k: None for k in self}
+
         return DatasetDict(
             {
                 k: dataset.map(
@@ -899,7 +901,7 @@ def map(
                     writer_batch_size=writer_batch_size,
                     features=features,
                     disable_nullable=disable_nullable,
-                    fn_kwargs=fn_kwargs,
+                    fn_kwargs={**fn_kwargs, "split": k} if with_split else fn_kwargs,
                     num_proc=num_proc,
                     desc=desc,
                 )