diff --git a/dlibrary/dlibrary.py b/dlibrary/dlibrary.py
index b71e671..dd5c4c6 100755
--- a/dlibrary/dlibrary.py
+++ b/dlibrary/dlibrary.py
@@ -444,9 +444,9 @@ def collate(args):
                 work_staging_dir.rmdir()
 
             if not collation_result:
-                print(f'Unable to deduce file structure for {work_id}, skipping')
+                warn(f'Unable to deduce file structure for {work_id}, skipping')
             elif collator.index == 0:
-                print(f'No files found for {work_id}, skipping')
+                warn(f'No files found for {work_id}, skipping')
 
             any_warnings = True