diff --git a/pyzebra/ccl_process.py b/pyzebra/ccl_process.py
index 435d2d0..0222846 100644
--- a/pyzebra/ccl_process.py
+++ b/pyzebra/ccl_process.py
@@ -92,9 +92,9 @@ def merge_datasets(dataset_into, dataset_from, log=logger):
         for ind, scan_from in enumerate(dataset_from):
             if _parameters_match(scan_into, scan_from) and not merged[ind]:
                 if scan_into["counts"].ndim == 3:
-                    merge_h5_scans(scan_into, scan_from)
+                    merge_h5_scans(scan_into, scan_from, log=log)
                 else:  # scan_into["counts"].ndim == 1
-                    merge_scans(scan_into, scan_from)
+                    merge_scans(scan_into, scan_from, log=log)
                 merged[ind] = True
 
     for scan_from in dataset_from: