diff --git a/src/backend/core/services/lobby.py b/src/backend/core/services/lobby.py
index 5b10228bb..e77cfbe82 100644
--- a/src/backend/core/services/lobby.py
+++ b/src/backend/core/services/lobby.py
@@ -197,7 +197,7 @@ class LobbyService:
             livekit_config = utils.generate_livekit_config(
                 room_id=room_id,
                 user=user,
-                username=username,
+                username=participant.username,
                 color=participant.color,
                 configuration=room.configuration,
                 participant_id=participant.id,
@@ -219,7 +219,7 @@ class LobbyService:
             livekit_config = utils.generate_livekit_config(
                 room_id=room_id,
                 user=user,
-                username=username,
+                username=participant.username,
                 color=participant.color,
                 configuration=room.configuration,
                 participant_id=participant.id,