diff --git a/python/adapters/ponsim_onu/main.py b/python/adapters/ponsim_onu/main.py
index d6418e9..c4c12db 100755
--- a/python/adapters/ponsim_onu/main.py
+++ b/python/adapters/ponsim_onu/main.py
@@ -379,6 +379,7 @@
                     # TODO: Add KV Store object reference
                     kv_store=self.args.backend,
                     default_topic=self.args.name,
+                    group_id_prefix=self.args.instance_id,
                     target_cls=ponsim_request_handler
                 )
             ).start()