diff --git a/mace/cli/fine_tuning_select.py b/mace/cli/fine_tuning_select.py
index 922caf25..a9349a6f 100644
--- a/mace/cli/fine_tuning_select.py
+++ b/mace/cli/fine_tuning_select.py
@@ -96,7 +96,7 @@ def parse_args() -> argparse.Namespace:
 
 
 def calculate_descriptors(
-    atoms: List[ase.Atoms], calc: MACECalculator, cutoffs: None | dict
+    atoms: List[ase.Atoms], calc: MACECalculator, cutoffs: None
 ) -> None:
     logging.info("Calculating descriptors")
     for mol in atoms: