diff --git a/tdactor/td/actor/impl/ActorInfo-decl.h b/tdactor/td/actor/impl/ActorInfo-decl.h
index 9af073f02..6726c0408 100644
--- a/tdactor/td/actor/impl/ActorInfo-decl.h
+++ b/tdactor/td/actor/impl/ActorInfo-decl.h
@@ -108,8 +108,6 @@ class ActorInfo final
   bool need_context() const;
   bool need_start_up() const;
 
-  bool must_wait() const;
-
  private:
   Deleter deleter_ = Deleter::None;
   bool need_context_ = true;
diff --git a/tdactor/td/actor/impl/ActorInfo.h b/tdactor/td/actor/impl/ActorInfo.h
index 16e1cfe77..f734f4c0b 100644
--- a/tdactor/td/actor/impl/ActorInfo.h
+++ b/tdactor/td/actor/impl/ActorInfo.h
@@ -60,10 +60,6 @@ inline bool ActorInfo::need_start_up() const {
   return need_start_up_;
 }
 
-inline bool ActorInfo::must_wait() const {
-  return !mailbox_.empty();
-}
-
 inline void ActorInfo::on_actor_moved(Actor *actor_new_ptr) {
   actor_ = actor_new_ptr;
 }
diff --git a/tdactor/td/actor/impl/Scheduler.h b/tdactor/td/actor/impl/Scheduler.h
index 298c3a05c..e41e31374 100644
--- a/tdactor/td/actor/impl/Scheduler.h
+++ b/tdactor/td/actor/impl/Scheduler.h
@@ -206,13 +206,9 @@ 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())) {  // run immediately
-    if (likely(actor_info->mailbox_.empty())) {
-      EventGuard guard(this, actor_info);
-      run_func(actor_info);
-    } else {
-      flush_mailbox(actor_info, &run_func, &event_func);
-    }
+             actor_info->mailbox_.empty())) {  // run immediately
+    EventGuard guard(this, actor_info);
+    run_func(actor_info);
   } else {
     if (on_current_sched) {
       add_to_mailbox(actor_info, event_func());