diff --git a/src/cal_tools/h5_copy_except.py b/src/cal_tools/h5_copy_except.py
index d983ec1280be0aeb24d9c2fdd43c12a61bee80d7..d70bd5b18052f3726be36c36231ab0258ff97ec8 100644
--- a/src/cal_tools/h5_copy_except.py
+++ b/src/cal_tools/h5_copy_except.py
@@ -25,7 +25,7 @@ def copy_except_tree(src_group: h5py.Group, dest_group: h5py.Group, except_tree)
         if except_tree_part is True:  # Totally excluded
             pass
         elif except_tree_part is None:  # Not excluded
-            src_group.copy(name, dest_group, name)
+            src_group.copy(name, dest_group, name, without_attrs=True)
         else:  # Partially excluded
             src_subgroup = src_group[name]
             assert isinstance(src_subgroup, h5py.Group)