diff --git a/caiman/source_extraction/cnmf/cnmf.py b/caiman/source_extraction/cnmf/cnmf.py
index b6aa67c14..36d996a59 100644
--- a/caiman/source_extraction/cnmf/cnmf.py
+++ b/caiman/source_extraction/cnmf/cnmf.py
@@ -396,7 +396,7 @@ def fit_file(self, motion_correct=False, indices=None, include_eval=False, outpu
                 files_to_move += fname_mc
             for f in files_to_move:
                 f = pathlib.Path(f)
-                shutil.copy(f, output_dir)
+                shutil.copy2(f, output_dir)
 
         if return_mc & motion_correct:
             return cnm2, mc