diff --git a/router/handler_link/bind.go b/router/handler_link/bind.go
index 28cf4d772..f89e1640a 100644
--- a/router/handler_link/bind.go
+++ b/router/handler_link/bind.go
@@ -178,7 +178,7 @@ func (self *heartbeatCallback) HeartbeatRespTx(int64) {}
 func (self *heartbeatCallback) HeartbeatRespRx(ts int64) {
 	now := time.Now()
 	self.lastResponse = now.UnixMilli()
-	self.latencyMetric.Update(time.Now().UnixNano() - ts)
+	self.latencyMetric.Update(now.UnixNano() - ts)
 }
 
 func (self *heartbeatCallback) CheckHeartBeat() {