diff --git a/tests/utils/test_transfer.py b/tests/utils/test_transfer.py
index 22a9e30e8..cceb3bf23 100644
--- a/tests/utils/test_transfer.py
+++ b/tests/utils/test_transfer.py
@@ -17,8 +17,18 @@ def test_systems_and_targets_to_dtype_and_device():
         blocks=[metatensor.torch.block_from_array(torch.tensor([[1.0]]))],
     )
 
+    systems = [system]
+    targets = {"energy": targets}
+
+    assert systems[0].positions.dtype == torch.float32
+    assert systems[0].positions.device == torch.device("cpu")
+    assert systems[0].cell.dtype == torch.float32
+    assert systems[0].types.device == torch.device("cpu")
+    assert targets["energy"].block().values.dtype == torch.float32
+    assert targets["energy"].block().values.device == torch.device("cpu")
+
     systems, targets = systems_and_targets_to_dtype_and_device(
-        [system], {"energy": targets}, torch.float64, torch.device("meta")
+        systems, targets, torch.float64, torch.device("meta")
     )
 
     assert systems[0].positions.dtype == torch.float64