diff --git a/clinicadl/caps_dataset/extraction/config.py b/clinicadl/caps_dataset/extraction/config.py
index c9d32e135..f33b5b9fe 100644
--- a/clinicadl/caps_dataset/extraction/config.py
+++ b/clinicadl/caps_dataset/extraction/config.py
@@ -62,7 +62,7 @@ def check_slice_direction(cls, v: str):
             return SliceDirection(str(v))
 
     @field_validator("discarded_slices", mode="before")
-    def compute_discarded_slice(cls, v: Union[int, tuple]) -> tuple[int, int]:
+    def compute_discarded_slice(cls, v: Union[int, tuple]) -> Tuple[int, int]:
         return compute_discarded_slices(v)