diff --git a/lib/cuckoo/core/database.py b/lib/cuckoo/core/database.py
index f0f69844b1c..4498db25a10 100644
--- a/lib/cuckoo/core/database.py
+++ b/lib/cuckoo/core/database.py
@@ -1610,7 +1610,7 @@ def demux_sample_and_add_to_db(
         extracted_files, demux_error_msgs = demux_sample(file_path, package, options, platform=platform)
         # check if len is 1 and the same file, if diff register file, and set parent
         if extracted_files and not any(file_path == path for path, _ in extracted_files):
-            _ = self.register_sample(File(file_path), source_url=source_url)
+            parent_sample = self.register_sample(File(file_path), source_url=source_url)
             if conf.cuckoo.delete_archive:
                 path_delete(file_path.decode())