diff --git a/include/transport/protocol.proto b/include/transport/protocol.proto
index 4a5b8f00a9ae5ac0d39ca0ad07f6282a4bae68c6..8d48386dad6dbda91cd8f4c55f422466864324eb 100644
--- a/include/transport/protocol.proto
+++ b/include/transport/protocol.proto
@@ -95,6 +95,7 @@ enum ParticipantFlag {
 	PARTICIPANT_FLAG_NOT_AUTHORIZED = 8;
 	PARTICIPANT_FLAG_ME = 16;
 	PARTICIPANT_FLAG_KICKED = 32;
+	PARTICIPANT_FLAG_ROOM_NOT_FOUND = 64;
 }
 
 message Participant {