diff --git a/planemo/galaxy/activity.py b/planemo/galaxy/activity.py
index 867b23120..de382a875 100644
--- a/planemo/galaxy/activity.py
+++ b/planemo/galaxy/activity.py
@@ -503,7 +503,7 @@ def outputs_dict(self):
 
     def download_output_to(self, ctx, dataset_details, output_directory, filename=None):
         if filename is None:
-            local_filename = sanitize_filename(dataset_details.get("cwl_file_name") or dataset_details.get("name"))
+            local_filename = f'{sanitize_filename(dataset_details.get("cwl_file_name") or dataset_details.get("name"))}__{dataset_details["uuid"]}'
         else:
             local_filename = filename
         destination = os.path.join(output_directory, local_filename)