diff --git a/lego/sys/rpcx/service.go b/lego/sys/rpcx/service.go
index 71a8d78c7..f81017b62 100644
--- a/lego/sys/rpcx/service.go
+++ b/lego/sys/rpcx/service.go
@@ -519,7 +519,7 @@ func (this *Service) clusterbroadcast(ctx context.Context, servicePath string, s
 				_call.Done = make(chan *client.Call, 10)
 
 				this.send(_ctx, conn, spath[0], serviceMethod, metadata, _call)
-				seq, _ := ctx.Value(seqKey{}).(*uint64)
+				seq, _ := _ctx.Value(seqKey{}).(*uint64)
 				select {
 				case <-_ctx.Done(): // cancel by context
 					this.mutex.Lock()