diff --git a/coolq/converter.go b/coolq/converter.go
index 30720e2..5910560 100644
--- a/coolq/converter.go
+++ b/coolq/converter.go
@@ -92,7 +92,7 @@ func (bot *CQBot) formatGroupMessage(m *message.GroupMessage) *event {
 			"name": m.Sender.AnonymousInfo.AnonymousNick,
 		}
 		gm["sender"].(global.MSG)["nickname"] = "匿名消息"
-		gm["sub_type"] = "anonymous"
+		typ = "message/group/anonymous"
 	} else {
 		group := bot.Client.FindGroup(m.GroupCode)
 		mem := group.FindMember(m.Sender.Uin)