diff --git a/tdactor/td/actor/impl/ActorInfo-decl.h b/tdactor/td/actor/impl/ActorInfo-decl.h
index 870e26dff..9af073f02 100644
--- a/tdactor/td/actor/impl/ActorInfo-decl.h
+++ b/tdactor/td/actor/impl/ActorInfo-decl.h
@@ -108,15 +108,13 @@ class ActorInfo final
   bool need_context() const;
   bool need_start_up() const;
 
-  void set_wait_generation(uint32 wait_generation);
-  bool must_wait(uint32 wait_generation) const;
+  bool must_wait() const;
 
  private:
   Deleter deleter_ = Deleter::None;
   bool need_context_ = true;
   bool need_start_up_ = true;
   bool is_running_ = false;
-  uint32 wait_generation_{0};
 
   std::atomic<int32> sched_id_{0};
   Actor *actor_ = nullptr;
diff --git a/tdactor/td/actor/impl/ActorInfo.h b/tdactor/td/actor/impl/ActorInfo.h
index 714ce43bd..16e1cfe77 100644
--- a/tdactor/td/actor/impl/ActorInfo.h
+++ b/tdactor/td/actor/impl/ActorInfo.h
@@ -50,7 +50,6 @@ inline void ActorInfo::init(int32 sched_id, Slice name, ObjectPool<ActorInfo>::O
   need_context_ = need_context;
   need_start_up_ = need_start_up;
   is_running_ = false;
-  wait_generation_ = 0;
 }
 
 inline bool ActorInfo::need_context() const {
@@ -61,12 +60,8 @@ inline bool ActorInfo::need_start_up() const {
   return need_start_up_;
 }
 
-inline void ActorInfo::set_wait_generation(uint32 wait_generation) {
-  wait_generation_ = wait_generation;
-}
-
-inline bool ActorInfo::must_wait(uint32 wait_generation) const {
-  return wait_generation_ == wait_generation || !mailbox_.empty();
+inline bool ActorInfo::must_wait() const {
+  return !mailbox_.empty();
 }
 
 inline void ActorInfo::on_actor_moved(Actor *actor_new_ptr) {
diff --git a/tdactor/td/actor/impl/Scheduler-decl.h b/tdactor/td/actor/impl/Scheduler-decl.h
index dd1816a77..c4f827768 100644
--- a/tdactor/td/actor/impl/Scheduler-decl.h
+++ b/tdactor/td/actor/impl/Scheduler-decl.h
@@ -200,8 +200,6 @@ class Scheduler {
   template <ActorSendType send_type, class RunFuncT, class EventFuncT>
   void send_impl(const ActorId<> &actor_id, const RunFuncT &run_func, const EventFuncT &event_func);
 
-  void inc_wait_generation();
-
   Timestamp run_timeout();
   void run_mailbox();
   Timestamp run_events(Timestamp timeout);
@@ -231,7 +229,6 @@ class Scheduler {
   bool has_guard_ = false;
   bool close_flag_ = false;
 
-  uint32 wait_generation_ = 1;
   int32 sched_id_ = 0;
   int32 sched_n_ = 0;
   std::shared_ptr<MpscPollableQueue<EventFull>> inbound_queue_;
diff --git a/tdactor/td/actor/impl/Scheduler.cpp b/tdactor/td/actor/impl/Scheduler.cpp
index f38ef1def..64a1e1423 100644
--- a/tdactor/td/actor/impl/Scheduler.cpp
+++ b/tdactor/td/actor/impl/Scheduler.cpp
@@ -497,7 +497,6 @@ void Scheduler::run_mailbox() {
     ListNode *node = actors_list.get();
     CHECK(node);
     auto actor_info = ActorInfo::from_list_node(node);
-    inc_wait_generation();
     flush_mailbox(actor_info, static_cast<void (*)(ActorInfo *)>(nullptr), static_cast<Event (*)()>(nullptr));
   }
   VLOG(actor) << "Run mailbox : finish " << actor_count_;
@@ -526,7 +525,6 @@ Timestamp Scheduler::run_timeout() {
   while (!timeout_queue_.empty() && timeout_queue_.top_key() < now) {
     HeapNode *node = timeout_queue_.pop();
     ActorInfo *actor_info = ActorInfo::from_heap_node(node);
-    inc_wait_generation();
     send<ActorSendType::Immediate>(actor_info->actor_id(), Event::timeout());
   }
   return get_timeout();
diff --git a/tdactor/td/actor/impl/Scheduler.h b/tdactor/td/actor/impl/Scheduler.h
index 176dbe425..298c3a05c 100644
--- a/tdactor/td/actor/impl/Scheduler.h
+++ b/tdactor/td/actor/impl/Scheduler.h
@@ -191,10 +191,6 @@ inline void Scheduler::before_tail_send(const ActorId<> &actor_id) {
   // TODO
 }
 
-inline void Scheduler::inc_wait_generation() {
-  wait_generation_ += 2;
-}
-
 template <ActorSendType send_type, class RunFuncT, class EventFuncT>
 void Scheduler::send_impl(const ActorId<> &actor_id, const RunFuncT &run_func, const EventFuncT &event_func) {
   ActorInfo *actor_info = actor_id.get_actor_info();
@@ -210,7 +206,7 @@ void Scheduler::send_impl(const ActorId<> &actor_id, const RunFuncT &run_func, c
   CHECK(has_guard_ || !on_current_sched);
 
   if (likely(send_type == ActorSendType::Immediate && on_current_sched && !actor_info->is_running() &&
-             !actor_info->must_wait(wait_generation_))) {  // run immediately
+             !actor_info->must_wait())) {  // run immediately
     if (likely(actor_info->mailbox_.empty())) {
       EventGuard guard(this, actor_info);
       run_func(actor_info);
@@ -220,9 +216,6 @@ void Scheduler::send_impl(const ActorId<> &actor_id, const RunFuncT &run_func, c
   } else {
     if (on_current_sched) {
       add_to_mailbox(actor_info, event_func());
-      if (send_type == ActorSendType::Later) {
-        actor_info->set_wait_generation(wait_generation_);
-      }
     } else {
       send_to_scheduler(actor_sched_id, actor_id, event_func());
     }