diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5ea5b8a9..aea3d155 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -621,6 +621,7 @@ set(TDLIB_SOURCE
   td/telegram/ReplyMarkup.h
   td/telegram/RequestActor.h
   td/telegram/RestrictionReason.h
+  td/telegram/ScheduledServerMessageId.h
   td/telegram/SecretChatActor.h
   td/telegram/SecretChatId.h
   td/telegram/SecretChatDb.h
diff --git a/td/telegram/MessageId.cpp b/td/telegram/MessageId.cpp
index 432634d8..6a4f6153 100644
--- a/td/telegram/MessageId.cpp
+++ b/td/telegram/MessageId.cpp
@@ -11,20 +11,16 @@
 
 namespace td {
 
-MessageId MessageId::get_scheduled_message_id(int32 server_message_id, int32 send_date) {
+MessageId::MessageId(ScheduledServerMessageId server_message_id, int32 send_date) {
   if (send_date <= (1 << 30)) {
     LOG(ERROR) << "Scheduled message send date " << send_date << " is in the past";
-    return MessageId();
+    return;
   }
-  if (server_message_id <= 0) {
-    LOG(ERROR) << "Scheduled message ID " << server_message_id << " is non-positive";
-    return MessageId();
+  if (!server_message_id.is_valid()) {
+    LOG(ERROR) << "Scheduled message ID " << server_message_id.get() << " is invalid";
+    return;
   }
-  if (server_message_id >= (1 << 18)) {
-    LOG(ERROR) << "Scheduled message ID " << server_message_id << " is too big";
-    return MessageId();
-  }
-  return MessageId((static_cast<int64>(send_date - (1 << 30)) << 21) | (server_message_id << 3) | SCHEDULED_MASK);
+  id = (static_cast<int64>(send_date - (1 << 30)) << 21) | (server_message_id.get() << 3) | SCHEDULED_MASK;
 }
 
 bool MessageId::is_valid() const {
@@ -92,13 +88,13 @@ StringBuilder &operator<<(StringBuilder &string_builder, MessageId message_id) {
       return string_builder << "invalid message " << message_id.get();
     }
     if (message_id.is_scheduled_server()) {
-      return string_builder << "server message " << message_id.get_scheduled_server_message_id_force();
+      return string_builder << "server message " << message_id.get_scheduled_server_message_id_force().get();
     }
     if (message_id.is_local()) {
-      return string_builder << "local message " << message_id.get_scheduled_server_message_id_force();
+      return string_builder << "local message " << message_id.get_scheduled_server_message_id_force().get();
     }
     if (message_id.is_yet_unsent()) {
-      return string_builder << "yet unsent message " << message_id.get_scheduled_server_message_id_force();
+      return string_builder << "yet unsent message " << message_id.get_scheduled_server_message_id_force().get();
     }
     return string_builder << "bugged message " << message_id.get();
   }
diff --git a/td/telegram/MessageId.h b/td/telegram/MessageId.h
index 5fa31894..4834e0eb 100644
--- a/td/telegram/MessageId.h
+++ b/td/telegram/MessageId.h
@@ -6,6 +6,7 @@
 //
 #pragma once
 
+#include "td/telegram/ScheduledServerMessageId.h"
 #include "td/telegram/ServerMessageId.h"
 
 #include "td/utils/common.h"
@@ -42,9 +43,9 @@ class MessageId {
 
   ServerMessageId get_server_message_id_force() const;
 
-  int32 get_scheduled_server_message_id_force() const {
+  ScheduledServerMessageId get_scheduled_server_message_id_force() const {
     CHECK(is_scheduled());
-    return static_cast<int32>((id >> 3) & ((1 << 18) - 1));
+    return ScheduledServerMessageId(static_cast<int32>((id >> 3) & ((1 << 18) - 1)));
   }
 
  public:
@@ -54,7 +55,7 @@ class MessageId {
       : id(static_cast<int64>(server_message_id.get()) << SERVER_ID_SHIFT) {
   }
 
-  static MessageId get_scheduled_message_id(int32 server_message_id, int32 send_date);
+  MessageId(ScheduledServerMessageId server_message_id, int32 send_date);
 
   explicit constexpr MessageId(int64 message_id) : id(message_id) {
   }
@@ -125,7 +126,7 @@ class MessageId {
 
   MessageId get_next_message_id(MessageType type) const;
 
-  int32 get_scheduled_server_message_id() const {
+  ScheduledServerMessageId get_scheduled_server_message_id() const {
     CHECK(is_scheduled_server());
     return get_scheduled_server_message_id_force();
   }
diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index a5c46018..1cf8ab51 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -4878,7 +4878,8 @@ vector<int32> MessagesManager::get_server_message_ids(const vector<MessageId> &m
 }
 
 vector<int32> MessagesManager::get_scheduled_server_message_ids(const vector<MessageId> &message_ids) {
-  return transform(message_ids, [](MessageId message_id) { return message_id.get_scheduled_server_message_id(); });
+  return transform(message_ids,
+                   [](MessageId message_id) { return message_id.get_scheduled_server_message_id().get(); });
 }
 
 tl_object_ptr<telegram_api::InputMessage> MessagesManager::get_input_message(MessageId message_id) {
@@ -13217,7 +13218,7 @@ void MessagesManager::get_messages_from_server(vector<FullMessageId> &&message_i
     auto message_id = full_message_id.get_message_id();
     if (!message_id.is_valid() || !message_id.is_server()) {
       if (message_id.is_valid_scheduled()) {
-        scheduled_message_ids.push_back(message_id.get_scheduled_server_message_id());
+        scheduled_message_ids.push_back(message_id.get_scheduled_server_message_id().get());
       }
       continue;
     }
diff --git a/td/telegram/ScheduledServerMessageId.h b/td/telegram/ScheduledServerMessageId.h
new file mode 100644
index 00000000..c9364ed4
--- /dev/null
+++ b/td/telegram/ScheduledServerMessageId.h
@@ -0,0 +1,53 @@
+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#pragma once
+
+#include "td/utils/common.h"
+
+#include <type_traits>
+
+namespace td {
+
+class ScheduledServerMessageId {
+  int32 id = 0;
+
+ public:
+  ScheduledServerMessageId() = default;
+
+  explicit ScheduledServerMessageId(int32 message_id) : id(message_id) {
+  }
+  template <class T, typename = std::enable_if_t<std::is_convertible<T, int32>::value>>
+  ScheduledServerMessageId(T message_id) = delete;
+
+  bool is_valid() const {
+    return id > 0 && id < (1 << 18);
+  }
+
+  int32 get() const {
+    return id;
+  }
+
+  bool operator==(const ScheduledServerMessageId &other) const {
+    return id == other.id;
+  }
+
+  bool operator!=(const ScheduledServerMessageId &other) const {
+    return id != other.id;
+  }
+
+  template <class StorerT>
+  void store(StorerT &storer) const {
+    storer.store_int(id);
+  }
+
+  template <class ParserT>
+  void parse(ParserT &parser) {
+    id = parser.fetch_int();
+  }
+};
+
+}  // namespace td
diff --git a/td/telegram/ServerMessageId.h b/td/telegram/ServerMessageId.h
index 39055794..4827bbe9 100644
--- a/td/telegram/ServerMessageId.h
+++ b/td/telegram/ServerMessageId.h
@@ -38,16 +38,6 @@ class ServerMessageId {
   bool operator!=(const ServerMessageId &other) const {
     return id != other.id;
   }
-
-  template <class StorerT>
-  void store(StorerT &storer) const {
-    storer.store_int(id);
-  }
-
-  template <class ParserT>
-  void parse(ParserT &parser) {
-    id = parser.fetch_int();
-  }
 };
 
 }  // namespace td