diff --git a/workers/sample-generator.py b/workers/sample-generator.py
index a83c4939e5ab5469b80ec4607cd6e7dc6a823c49..511aaa47eb18ae6709910590c41b863dbbe287e7 100644
--- a/workers/sample-generator.py
+++ b/workers/sample-generator.py
@@ -262,7 +262,7 @@ def callback(channel, method, properties, body):
                              uuid=cfg['session']['current_uuid'],
                              step='sampler',
                              status=message,
-                             uuid_prefix='',
+                             uuid_prefix='meta',
                              info=uuid,
                              loglevel='INFO',
                              progress_ratio=0.9