diff --git a/monai/transforms/croppad/dictionary.py b/monai/transforms/croppad/dictionary.py
index faa96b1e4c..4ec14e0a7d 100644
--- a/monai/transforms/croppad/dictionary.py
+++ b/monai/transforms/croppad/dictionary.py
@@ -693,7 +693,7 @@ def __init__(
         source_key: str,
         select_fn: Callable = is_positive,
         channel_indices: Optional[IndexSelection] = None,
-        margin: int = 0,
+        margin: Union[Sequence[int], int] = 0,
         k_divisible: Union[Sequence[int], int] = 1,
         mode: Union[NumpyPadMode, str] = NumpyPadMode.CONSTANT,
         start_coord_key: str = "foreground_start_coord",