diff --git a/td/telegram/CallActor.cpp b/td/telegram/CallActor.cpp
index 9e330f54d..1ff807884 100644
--- a/td/telegram/CallActor.cpp
+++ b/td/telegram/CallActor.cpp
@@ -17,7 +17,6 @@
 #include "td/telegram/net/NetQueryDispatcher.h"
 #include "td/telegram/NotificationManager.h"
 #include "td/telegram/Td.h"
-#include "td/telegram/telegram_api.hpp"
 #include "td/telegram/UpdatesManager.h"
 
 #include "td/utils/algorithm.h"
@@ -475,8 +474,25 @@ void CallActor::on_save_log_query_result(FileId file_id, Promise<Unit> promise,
 // Requests
 void CallActor::update_call(tl_object_ptr<telegram_api::PhoneCall> call) {
   LOG(INFO) << "Receive " << to_string(call);
-  Status status;
-  downcast_call(*call, [&](auto &call) { status = this->do_update_call(call); });
+  auto status = [&] {
+    switch (call->get_id()) {
+      case telegram_api::phoneCallEmpty::ID:
+        return do_update_call(static_cast<telegram_api::phoneCallEmpty &>(*call));
+      case telegram_api::phoneCallWaiting::ID:
+        return do_update_call(static_cast<telegram_api::phoneCallWaiting &>(*call));
+      case telegram_api::phoneCallRequested::ID:
+        return do_update_call(static_cast<telegram_api::phoneCallRequested &>(*call));
+      case telegram_api::phoneCallAccepted::ID:
+        return do_update_call(static_cast<telegram_api::phoneCallAccepted &>(*call));
+      case telegram_api::phoneCall::ID:
+        return do_update_call(static_cast<telegram_api::phoneCall &>(*call));
+      case telegram_api::phoneCallDiscarded::ID:
+        return do_update_call(static_cast<telegram_api::phoneCallDiscarded &>(*call));
+      default:
+        UNREACHABLE();
+        return Status::OK();
+    }
+  }();
   if (status.is_error()) {
     LOG(INFO) << "Receive error " << status << ", while handling update " << to_string(call);
     on_error(std::move(status));
diff --git a/td/telegram/CallManager.cpp b/td/telegram/CallManager.cpp
index aa2c907c7..3f61c0946 100644
--- a/td/telegram/CallManager.cpp
+++ b/td/telegram/CallManager.cpp
@@ -6,8 +6,6 @@
 //
 #include "td/telegram/CallManager.h"
 
-#include "td/telegram/telegram_api.hpp"
-
 #include "td/utils/common.h"
 #include "td/utils/logging.h"
 #include "td/utils/misc.h"
@@ -21,8 +19,25 @@ CallManager::CallManager(ActorShared<> parent) : parent_(std::move(parent)) {
 }
 
 void CallManager::update_call(Update call) {
-  int64 call_id = 0;
-  downcast_call(*call->phone_call_, [&](auto &update) { call_id = update.id_; });
+  auto call_id = [phone_call = call->phone_call_.get()] {
+    switch (phone_call->get_id()) {
+      case telegram_api::phoneCallEmpty::ID:
+        return static_cast<const telegram_api::phoneCallEmpty *>(phone_call)->id_;
+      case telegram_api::phoneCallWaiting::ID:
+        return static_cast<const telegram_api::phoneCallWaiting *>(phone_call)->id_;
+      case telegram_api::phoneCallRequested::ID:
+        return static_cast<const telegram_api::phoneCallRequested *>(phone_call)->id_;
+      case telegram_api::phoneCallAccepted::ID:
+        return static_cast<const telegram_api::phoneCallAccepted *>(phone_call)->id_;
+      case telegram_api::phoneCall::ID:
+        return static_cast<const telegram_api::phoneCall *>(phone_call)->id_;
+      case telegram_api::phoneCallDiscarded::ID:
+        return static_cast<const telegram_api::phoneCallDiscarded *>(phone_call)->id_;
+      default:
+        UNREACHABLE();
+        return static_cast<int64>(0);
+    }
+  }();
   LOG(DEBUG) << "Receive UpdateCall for " << call_id;
 
   auto &info = call_info_[call_id];
diff --git a/td/telegram/ContactsManager.cpp b/td/telegram/ContactsManager.cpp
index 52b52c68f..1835b315e 100644
--- a/td/telegram/ContactsManager.cpp
+++ b/td/telegram/ContactsManager.cpp
@@ -49,7 +49,6 @@
 #include "td/telegram/StoryManager.h"
 #include "td/telegram/Td.h"
 #include "td/telegram/TdDb.h"
-#include "td/telegram/telegram_api.hpp"
 #include "td/telegram/UpdatesManager.h"
 #include "td/telegram/Version.h"
 
@@ -12750,7 +12749,25 @@ void ContactsManager::on_get_user_photos(UserId user_id, int32 offset, int32 lim
 
 void ContactsManager::on_get_chat(tl_object_ptr<telegram_api::Chat> &&chat, const char *source) {
   LOG(DEBUG) << "Receive from " << source << ' ' << to_string(chat);
-  downcast_call(*chat, [this, source](auto &c) { this->on_chat_update(c, source); });
+  switch (chat->get_id()) {
+    case telegram_api::chatEmpty::ID:
+      on_chat_update(static_cast<telegram_api::chatEmpty &>(*chat), source);
+      break;
+    case telegram_api::chat::ID:
+      on_chat_update(static_cast<telegram_api::chat &>(*chat), source);
+      break;
+    case telegram_api::chatForbidden::ID:
+      on_chat_update(static_cast<telegram_api::chatForbidden &>(*chat), source);
+      break;
+    case telegram_api::channel::ID:
+      on_chat_update(static_cast<telegram_api::channel &>(*chat), source);
+      break;
+    case telegram_api::channelForbidden::ID:
+      on_chat_update(static_cast<telegram_api::channelForbidden &>(*chat), source);
+      break;
+    default:
+      UNREACHABLE();
+  }
 }
 
 void ContactsManager::on_get_chats(vector<tl_object_ptr<telegram_api::Chat>> &&chats, const char *source) {
diff --git a/td/telegram/InlineQueriesManager.cpp b/td/telegram/InlineQueriesManager.cpp
index 85ddfa40f..98d461119 100644
--- a/td/telegram/InlineQueriesManager.cpp
+++ b/td/telegram/InlineQueriesManager.cpp
@@ -36,7 +36,6 @@
 #include "td/telegram/Td.h"
 #include "td/telegram/td_api.hpp"
 #include "td/telegram/TdDb.h"
-#include "td/telegram/telegram_api.hpp"
 #include "td/telegram/ThemeManager.h"
 #include "td/telegram/UpdatesManager.h"
 #include "td/telegram/Venue.h"
@@ -1856,9 +1855,17 @@ void InlineQueriesManager::on_get_inline_query_results(DialogId dialog_id, UserI
             continue;
           }
 
-          vector<tl_object_ptr<telegram_api::DocumentAttribute>> attributes;
-          downcast_call(*result->content_,
-                        [&attributes](auto &web_document) { attributes = std::move(web_document.attributes_); });
+          auto attributes = [content = result->content_.get()] {
+            switch (content->get_id()) {
+              case telegram_api::webDocument::ID:
+                return std::move(static_cast<telegram_api::webDocument *>(content)->attributes_);
+              case telegram_api::webDocumentNoProxy::ID:
+                return std::move(static_cast<telegram_api::webDocumentNoProxy *>(content)->attributes_);
+              default:
+                UNREACHABLE();
+                return vector<telegram_api::object_ptr<telegram_api::DocumentAttribute>>();
+            }
+          }();
 
           bool is_animation = result->type_ == "gif" && (content_type == "image/gif" || content_type == "video/mp4");
           if (is_animation) {
diff --git a/td/telegram/SecretChatsManager.cpp b/td/telegram/SecretChatsManager.cpp
index 47e7911c1..5bbeb1d4f 100644
--- a/td/telegram/SecretChatsManager.cpp
+++ b/td/telegram/SecretChatsManager.cpp
@@ -18,7 +18,6 @@
 #include "td/telegram/SequenceDispatcher.h"
 #include "td/telegram/StateManager.h"
 #include "td/telegram/TdDb.h"
-#include "td/telegram/telegram_api.hpp"
 
 #include "td/mtproto/DhCallback.h"
 
@@ -181,12 +180,24 @@ void SecretChatsManager::on_update_chat(tl_object_ptr<telegram_api::updateEncryp
 }
 
 void SecretChatsManager::do_update_chat(tl_object_ptr<telegram_api::updateEncryption> update) {
-  int32 id = 0;
-  downcast_call(*update->chat_, [&](auto &x) { id = x.id_; });
-
-  send_closure(
-      update->chat_->get_id() == telegram_api::encryptedChatDiscarded::ID ? get_chat_actor(id) : create_chat_actor(id),
-      &SecretChatActor::update_chat, std::move(update->chat_));
+  auto actor_id = [this, chat = update->chat_.get()] {
+    switch (chat->get_id()) {
+      case telegram_api::encryptedChatEmpty::ID:
+        return create_chat_actor(static_cast<const telegram_api::encryptedChatEmpty *>(chat)->id_);
+      case telegram_api::encryptedChatWaiting::ID:
+        return create_chat_actor(static_cast<const telegram_api::encryptedChatWaiting *>(chat)->id_);
+      case telegram_api::encryptedChatRequested::ID:
+        return create_chat_actor(static_cast<const telegram_api::encryptedChatRequested *>(chat)->id_);
+      case telegram_api::encryptedChat::ID:
+        return create_chat_actor(static_cast<const telegram_api::encryptedChat *>(chat)->id_);
+      case telegram_api::encryptedChatDiscarded::ID:
+        return get_chat_actor(static_cast<const telegram_api::encryptedChatDiscarded *>(chat)->id_);
+      default:
+        UNREACHABLE();
+        return ActorId<SecretChatActor>();
+    }
+  }();
+  send_closure(actor_id, &SecretChatActor::update_chat, std::move(update->chat_));
 }
 
 void SecretChatsManager::on_new_message(tl_object_ptr<telegram_api::EncryptedMessage> &&message_ptr,
@@ -198,14 +209,24 @@ void SecretChatsManager::on_new_message(tl_object_ptr<telegram_api::EncryptedMes
 
   auto event = make_unique<log_event::InboundSecretMessage>();
   event->promise = std::move(promise);
-  downcast_call(*message_ptr, [&](auto &x) {
-    event->chat_id = x.chat_id_;
-    event->date = x.date_;
-    event->encrypted_message = std::move(x.bytes_);
-  });
-  if (message_ptr->get_id() == telegram_api::encryptedMessage::ID) {
-    auto message = move_tl_object_as<telegram_api::encryptedMessage>(message_ptr);
-    event->file = EncryptedFile::get_encrypted_file(std::move(message->file_));
+  switch (message_ptr->get_id()) {
+    case telegram_api::encryptedMessage::ID: {
+      auto message = telegram_api::move_object_as<telegram_api::encryptedMessage>(message_ptr);
+      event->chat_id = message->chat_id_;
+      event->date = message->date_;
+      event->encrypted_message = std::move(message->bytes_);
+      event->file = EncryptedFile::get_encrypted_file(std::move(message->file_));
+      break;
+    }
+    case telegram_api::encryptedMessageService::ID: {
+      auto message = telegram_api::move_object_as<telegram_api::encryptedMessageService>(message_ptr);
+      event->chat_id = message->chat_id_;
+      event->date = message->date_;
+      event->encrypted_message = std::move(message->bytes_);
+      break;
+    }
+    default:
+      UNREACHABLE();
   }
   add_inbound_message(std::move(event));
 }
diff --git a/td/telegram/SecureValue.cpp b/td/telegram/SecureValue.cpp
index 402a4101e..6c7c79a4b 100644
--- a/td/telegram/SecureValue.cpp
+++ b/td/telegram/SecureValue.cpp
@@ -15,7 +15,6 @@
 #include "td/telegram/misc.h"
 #include "td/telegram/net/DcId.h"
 #include "td/telegram/OrderInfo.h"
-#include "td/telegram/telegram_api.hpp"
 
 #include "td/utils/algorithm.h"
 #include "td/utils/base64.h"
@@ -24,7 +23,6 @@
 #include "td/utils/JsonBuilder.h"
 #include "td/utils/logging.h"
 #include "td/utils/misc.h"
-#include "td/utils/overloaded.h"
 #include "td/utils/SliceBuilder.h"
 #include "td/utils/utf8.h"
 
@@ -399,12 +397,10 @@ telegram_api::object_ptr<telegram_api::InputSecureFile> get_input_secure_file_ob
   if (res == nullptr) {
     return file_manager->get_file_view(file.file.file_id).remote_location().as_input_secure_file();
   }
-  telegram_api::downcast_call(*res, overloaded(
-                                        [&](telegram_api::inputSecureFileUploaded &uploaded) {
-                                          uploaded.secret_ = BufferSlice(file.encrypted_secret);
-                                          uploaded.file_hash_ = BufferSlice(file.file_hash);
-                                        },
-                                        [&](telegram_api::inputSecureFile &) { UNREACHABLE(); }));
+  CHECK(res->get_id() == telegram_api::inputSecureFileUploaded::ID);
+  auto uploaded = static_cast<telegram_api::inputSecureFileUploaded *>(res.get());
+  uploaded->secret_ = BufferSlice(file.encrypted_secret);
+  uploaded->file_hash_ = BufferSlice(file.file_hash);
   return res;
 }