diff --git a/tdactor/td/actor/MultiPromise.h b/tdactor/td/actor/MultiPromise.h
index 630a689ad..017bc5988 100644
--- a/tdactor/td/actor/MultiPromise.h
+++ b/tdactor/td/actor/MultiPromise.h
@@ -91,6 +91,13 @@ class MultiPromiseActor final
   }
 };
 
+template <>
+class ActorTraits<MultiPromiseActor> {
+ public:
+  static constexpr bool need_context = false;
+  static constexpr bool need_start_up = true;
+};
+
 class MultiPromiseActorSafe final : public MultiPromiseInterface {
  public:
   void add_promise(Promise<Unit> &&promise) final;
diff --git a/tdactor/td/actor/SleepActor.h b/tdactor/td/actor/SleepActor.h
index 659db5f1a..3e257dd8d 100644
--- a/tdactor/td/actor/SleepActor.h
+++ b/tdactor/td/actor/SleepActor.h
@@ -31,4 +31,11 @@ class SleepActor final : public Actor {
   }
 };
 
+template <>
+class ActorTraits<SleepActor> {
+ public:
+  static constexpr bool need_context = false;
+  static constexpr bool need_start_up = true;
+};
+
 }  // namespace td