diff --git a/coolq/bot.go b/coolq/bot.go
index 1aca793..d27ff7b 100644
--- a/coolq/bot.go
+++ b/coolq/bot.go
@@ -25,7 +25,6 @@ type CQBot struct {
 
 	events            []func(MSG)
 	db                *nutsdb.DB
-	heartbeatInterval uint16
 	friendReqCache    sync.Map
 	invitedReqCache   sync.Map
 	joinReqCache      sync.Map