diff --git a/benchmark/bench_db.cpp b/benchmark/bench_db.cpp
index dc768e9d9..fa10492e9 100644
--- a/benchmark/bench_db.cpp
+++ b/benchmark/bench_db.cpp
@@ -200,7 +200,7 @@ class SeqKvBench : public td::Benchmark {
   td::SeqKeyValue kv;
   void run(int n) override {
     for (int i = 0; i < n; i++) {
-      kv.set(td::to_string(i % 10), td::to_string(i));
+      kv.set(PSLICE() << i % 10, PSLICE() << i);
     }
   }
 };
diff --git a/benchmark/bench_misc.cpp b/benchmark/bench_misc.cpp
index 68cf4819d..1674e9ba9 100644
--- a/benchmark/bench_misc.cpp
+++ b/benchmark/bench_misc.cpp
@@ -219,7 +219,7 @@ class CreateFileBench : public Benchmark {
   }
   void run(int n) override {
     for (int i = 0; i < n; i++) {
-      FileFd::open("A/" + to_string(i), FileFd::Flags::Write | FileFd::Flags::Create).move_as_ok().close();
+      FileFd::open(PSLICE() << "A/" << i, FileFd::Flags::Write | FileFd::Flags::Create).move_as_ok().close();
     }
   }
   void tear_down() override {
@@ -232,6 +232,7 @@ class CreateFileBench : public Benchmark {
     });
   }
 };
+
 class WalkPathBench : public Benchmark {
   string get_description() const override {
     return "walk_path";
@@ -239,7 +240,7 @@ class WalkPathBench : public Benchmark {
   void start_up_n(int n) override {
     mkdir("A").ensure();
     for (int i = 0; i < n; i++) {
-      FileFd::open("A/" + to_string(i), FileFd::Flags::Write | FileFd::Flags::Create).move_as_ok().close();
+      FileFd::open(PSLICE() << "A/" << i, FileFd::Flags::Write | FileFd::Flags::Create).move_as_ok().close();
     }
   }
   void run(int n) override {
diff --git a/td/mtproto/Handshake.cpp b/td/mtproto/Handshake.cpp
index d8f47bba6..e7a5aeb03 100644
--- a/td/mtproto/Handshake.cpp
+++ b/td/mtproto/Handshake.cpp
@@ -109,7 +109,7 @@ Status AuthKeyHandshake::on_res_pq(Slice message, Callback *connection, PublicRs
 
   // req_DH_params#d712e4be nonce:int128 server_nonce:int128 p:string q:string public_key_fingerprint:long
   // encrypted_data:string = Server_DH_Params
-  mtproto_api::req_DH_params req_dh_params(nonce, server_nonce, p, q, rsa_fingerprint, std::move(encrypted_data));
+  mtproto_api::req_DH_params req_dh_params(nonce, server_nonce, p, q, rsa_fingerprint, encrypted_data);
 
   send(connection, create_storer(req_dh_params));
   state_ = ServerDHParams;
@@ -202,7 +202,7 @@ Status AuthKeyHandshake::on_server_dh_params(Slice message, Callback *connection
   tmp_KDF(server_nonce, new_nonce, &tmp_aes_key, &tmp_aes_iv);
   aes_ige_encrypt(tmp_aes_key, &tmp_aes_iv, encrypted_data, encrypted_data);
 
-  mtproto_api::set_client_DH_params set_client_dh_params(nonce, server_nonce, std::move(encrypted_data_str));
+  mtproto_api::set_client_DH_params set_client_dh_params(nonce, server_nonce, encrypted_data);
   send(connection, create_storer(set_client_dh_params));
 
   auth_key = AuthKey(dh_auth_key_id(auth_key_str), std::move(auth_key_str));
diff --git a/td/telegram/ContactsManager.cpp b/td/telegram/ContactsManager.cpp
index 4bdc08e95..8408ae5eb 100644
--- a/td/telegram/ContactsManager.cpp
+++ b/td/telegram/ContactsManager.cpp
@@ -5185,7 +5185,7 @@ void ContactsManager::on_binlog_user_event(BinlogEvent &&event) {
 }
 
 string ContactsManager::get_user_database_key(UserId user_id) {
-  return "us" + to_string(user_id.get());
+  return PSTRING() << "us" << user_id.get();
 }
 
 string ContactsManager::get_user_database_value(const User *u) {
@@ -5434,7 +5434,7 @@ void ContactsManager::on_binlog_chat_event(BinlogEvent &&event) {
 }
 
 string ContactsManager::get_chat_database_key(ChatId chat_id) {
-  return "gr" + to_string(chat_id.get());
+  return PSTRING() << "gr" << chat_id.get();
 }
 
 string ContactsManager::get_chat_database_value(const Chat *c) {
@@ -5657,7 +5657,7 @@ void ContactsManager::on_binlog_channel_event(BinlogEvent &&event) {
 }
 
 string ContactsManager::get_channel_database_key(ChannelId channel_id) {
-  return "ch" + to_string(channel_id.get());
+  return PSTRING() << "ch" << channel_id.get();
 }
 
 string ContactsManager::get_channel_database_value(const Channel *c) {
@@ -5874,7 +5874,7 @@ void ContactsManager::on_binlog_secret_chat_event(BinlogEvent &&event) {
 }
 
 string ContactsManager::get_secret_chat_database_key(SecretChatId secret_chat_id) {
-  return "sc" + to_string(secret_chat_id.get());
+  return PSTRING() << "sc" << secret_chat_id.get();
 }
 
 string ContactsManager::get_secret_chat_database_value(const SecretChat *c) {
diff --git a/td/telegram/InlineQueriesManager.cpp b/td/telegram/InlineQueriesManager.cpp
index 9a2625926..1554d0650 100644
--- a/td/telegram/InlineQueriesManager.cpp
+++ b/td/telegram/InlineQueriesManager.cpp
@@ -645,7 +645,7 @@ void InlineQueriesManager::answer_inline_query(int64 inline_query_id, bool is_pe
         type = "geo";
         id = std::move(location->id_);
         title = std::move(location->title_);
-        description = to_string(location->location_->latitude_) + " " + to_string(location->location_->longitude_);
+        description = PSTRING() << location->location_->latitude_ << ' ' << location->location_->longitude_;
         thumbnail_url = std::move(location->thumbnail_url_);
         // duration = location->live_period_;
         if (!thumbnail_url.empty()) {
diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index 109254ad8..1e18f4b16 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -25246,8 +25246,8 @@ void MessagesManager::update_last_dialog_date() {
   }
 
   if (G()->parameters().use_message_db && last_database_server_dialog_date_ < last_server_dialog_date_) {
-    auto last_server_dialog_date_string = to_string(last_server_dialog_date_.get_order()) + " " +
-                                          to_string(last_server_dialog_date_.get_dialog_id().get());
+    auto last_server_dialog_date_string = PSTRING() << last_server_dialog_date_.get_order() << ' '
+                                                    << last_server_dialog_date_.get_dialog_id().get();
     G()->td_db()->get_binlog_pmc()->set("last_server_dialog_date", last_server_dialog_date_string);
     LOG(INFO) << "Save last server dialog date " << last_server_dialog_date_string;
     last_database_server_dialog_date_ = last_server_dialog_date_;
@@ -25385,7 +25385,7 @@ void MessagesManager::load_notification_settings() {
 string MessagesManager::get_channel_pts_key(DialogId dialog_id) {
   CHECK(dialog_id.get_type() == DialogType::Channel);
   auto channel_id = dialog_id.get_channel_id();
-  return "ch.p" + to_string(channel_id.get());
+  return PSTRING() << "ch.p" << channel_id.get();
 }
 
 int32 MessagesManager::load_channel_pts(DialogId dialog_id) const {
diff --git a/td/telegram/SecureValue.cpp b/td/telegram/SecureValue.cpp
index 29c86b565..cb85abb66 100644
--- a/td/telegram/SecureValue.cpp
+++ b/td/telegram/SecureValue.cpp
@@ -316,7 +316,7 @@ EncryptedSecureFile get_encrypted_secure_file(FileManager *file_manager,
       }
       result.file.file_id = file_manager->register_remote(
           FullRemoteFileLocation(FileType::Secure, secure_file->id_, secure_file->access_hash_, DcId::internal(dc_id)),
-          FileLocationSource::FromServer, DialogId(), 0, secure_file->size_, to_string(secure_file->id_) + ".jpg");
+          FileLocationSource::FromServer, DialogId(), 0, secure_file->size_, PSTRING() << secure_file->id_ << ".jpg");
       result.file.date = secure_file->date_;
       if (result.file.date < 0) {
         LOG(ERROR) << "Receive wrong date " << result.file.date;
diff --git a/td/telegram/StickersManager.cpp b/td/telegram/StickersManager.cpp
index f04bb2a71..6e909a70c 100644
--- a/td/telegram/StickersManager.cpp
+++ b/td/telegram/StickersManager.cpp
@@ -1025,7 +1025,7 @@ std::pair<int64, FileId> StickersManager::on_get_sticker_document(tl_object_ptr<
   int64 document_id = document->id_;
   FileId sticker_id = td_->file_manager_->register_remote(
       FullRemoteFileLocation(FileType::Sticker, document_id, document->access_hash_, DcId::internal(document->dc_id_)),
-      FileLocationSource::FromServer, DialogId(), document->size_, 0, to_string(document_id) + ".webp");
+      FileLocationSource::FromServer, DialogId(), document->size_, 0, PSTRING() << document_id << ".webp");
 
   PhotoSize thumbnail = get_photo_size(td_->file_manager_.get(), FileType::Thumbnail, 0, 0, DialogId(),
                                        std::move(document->thumb_), has_webp_thumbnail(sticker));
@@ -1471,7 +1471,7 @@ int64 StickersManager::on_get_sticker_set(tl_object_ptr<telegram_api::stickerSet
       s->is_changed = true;
 
       if (installed_sticker_sets_hints_[s->is_masks].has_key(set_id)) {
-        installed_sticker_sets_hints_[s->is_masks].add(set_id, s->title + " " + s->short_name);
+        installed_sticker_sets_hints_[s->is_masks].add(set_id, PSLICE() << s->title << ' ' << s->short_name);
       }
     }
     if (s->short_name != set->short_name_) {
@@ -1482,7 +1482,7 @@ int64 StickersManager::on_get_sticker_set(tl_object_ptr<telegram_api::stickerSet
       s->is_changed = true;
 
       if (installed_sticker_sets_hints_[s->is_masks].has_key(set_id)) {
-        installed_sticker_sets_hints_[s->is_masks].add(set_id, s->title + " " + s->short_name);
+        installed_sticker_sets_hints_[s->is_masks].add(set_id, PSLICE() << s->title << ' ' << s->short_name);
       }
     }
 
@@ -2267,8 +2267,8 @@ void StickersManager::on_update_sticker_set(StickerSet *sticker_set, bool is_ins
     need_update_installed_sticker_sets_[sticker_set->is_masks] = true;
 
     if (is_added) {
-      installed_sticker_sets_hints_[sticker_set->is_masks].add(sticker_set->id,
-                                                               sticker_set->title + " " + sticker_set->short_name);
+      installed_sticker_sets_hints_[sticker_set->is_masks].add(
+          sticker_set->id, PSLICE() << sticker_set->title << ' ' << sticker_set->short_name);
       sticker_set_ids.insert(sticker_set_ids.begin(), sticker_set->id);
     } else {
       installed_sticker_sets_hints_[sticker_set->is_masks].remove(sticker_set->id);
@@ -2396,11 +2396,11 @@ void StickersManager::on_load_installed_sticker_sets_finished(bool is_masks, vec
 }
 
 string StickersManager::get_sticker_set_database_key(int64 set_id) {
-  return "ss" + to_string(set_id);
+  return PSTRING() << "ss" << set_id;
 }
 
 string StickersManager::get_full_sticker_set_database_key(int64 set_id) {
-  return "ssf" + to_string(set_id);
+  return PSTRING() << "ssf" << set_id;
 }
 
 string StickersManager::get_sticker_set_database_value(const StickerSet *s, bool with_stickers) {
diff --git a/td/telegram/StorageManager.cpp b/td/telegram/StorageManager.cpp
index bd5721277..8d04bf318 100644
--- a/td/telegram/StorageManager.cpp
+++ b/td/telegram/StorageManager.cpp
@@ -139,8 +139,8 @@ int64 StorageManager::get_db_size() {
   };
 
   G()->td_db()->with_db_path([&](CSlice path) { add_path(path).ignore(); });
-  add_path(G()->parameters().database_directory + "log").ignore();
-  add_path(G()->parameters().database_directory + "log.old").ignore();
+  add_path(PSLICE() << G()->parameters().database_directory << "log").ignore();
+  add_path(PSLICE() << G()->parameters().database_directory << "log.old").ignore();
   return size;
 }
 
diff --git a/td/telegram/WebPagesManager.cpp b/td/telegram/WebPagesManager.cpp
index 8f54a9ab1..127487fa0 100644
--- a/td/telegram/WebPagesManager.cpp
+++ b/td/telegram/WebPagesManager.cpp
@@ -1773,7 +1773,7 @@ WebPageId WebPagesManager::get_web_page_instant_view(WebPageId web_page_id, bool
 }
 
 string WebPagesManager::get_web_page_instant_view_database_key(WebPageId web_page_id) {
-  return "wpiv" + to_string(web_page_id.get());
+  return PSTRING() << "wpiv" << web_page_id.get();
 }
 
 void WebPagesManager::load_web_page_instant_view(WebPageId web_page_id, bool force_full, Promise<Unit> &&promise) {
@@ -2675,7 +2675,7 @@ void WebPagesManager::on_binlog_web_page_event(BinlogEvent &&event) {
 }
 
 string WebPagesManager::get_web_page_database_key(WebPageId web_page_id) {
-  return "wp" + to_string(web_page_id.get());
+  return PSTRING() << "wp" << web_page_id.get();
 }
 
 void WebPagesManager::on_save_web_page_to_database(WebPageId web_page_id, bool success) {
diff --git a/td/telegram/files/FileDb.cpp b/td/telegram/files/FileDb.cpp
index b888d956c..ad8a33170 100644
--- a/td/telegram/files/FileDb.cpp
+++ b/td/telegram/files/FileDb.cpp
@@ -86,7 +86,7 @@ class FileDb : public FileDbInterface {
         current_pmc_id_ = id;
       }
 
-      pmc.erase("file" + to_string(id));
+      pmc.erase(PSTRING() << "file" << id);
       LOG(DEBUG) << "ERASE " << format::as_hex_dump<4>(Slice(PSLICE() << "file" << to_string(id)));
 
       if (!remote_key.empty()) {
@@ -114,7 +114,7 @@ class FileDb : public FileDbInterface {
         current_pmc_id_ = id;
       }
 
-      pmc.set("file" + to_string(id), file_data);
+      pmc.set(PSTRING() << "file" << id, file_data);
 
       if (!remote_key.empty()) {
         pmc.set(remote_key, to_string(id));
@@ -162,7 +162,7 @@ class FileDb : public FileDbInterface {
     }
 
     void do_store_file_data_ref(Id id, Id new_id) {
-      file_pmc().set("file" + to_string(id), "@@" + to_string(new_id));
+      file_pmc().set(PSTRING() << "file" << id, PSTRING() << "@@" << new_id);
     }
   };
 
diff --git a/td/telegram/files/FileManager.cpp b/td/telegram/files/FileManager.cpp
index b18c73a61..58d7954ef 100644
--- a/td/telegram/files/FileManager.cpp
+++ b/td/telegram/files/FileManager.cpp
@@ -1854,7 +1854,7 @@ Result<FileId> FileManager::from_persistent_id(CSlice persistent_id, FileType fi
 
   auto r_binary = base64url_decode(persistent_id);
   if (r_binary.is_error()) {
-    return Status::Error(10, "Wrong remote file id specified: " + r_binary.error().message().str());
+    return Status::Error(10, PSLICE() << "Wrong remote file id specified: " << r_binary.error().message());
   }
   auto binary = r_binary.move_as_ok();
   if (binary.empty()) {
diff --git a/td/telegram/net/Session.cpp b/td/telegram/net/Session.cpp
index a88b02636..c014a0b2a 100644
--- a/td/telegram/net/Session.cpp
+++ b/td/telegram/net/Session.cpp
@@ -435,7 +435,7 @@ void Session::on_closed(Status status) {
         VLOG(net_query) << "resend query (on_disconnected, no ack) " << query;
         query->set_message_id(0);
         query->cancel_slot_.clear_event();
-        query->set_error(Status::Error(500, "Session failed: " + status.message().str()),
+        query->set_error(Status::Error(500, PSLICE() << "Session failed: " << status.message()),
                          current_info_->connection->get_name().str());
         return_query(std::move(query));
         it = sent_queries_.erase(it);
diff --git a/tdactor/test/actors_workers.cpp b/tdactor/test/actors_workers.cpp
index 8a13f15ba..3809d0072 100644
--- a/tdactor/test/actors_workers.cpp
+++ b/tdactor/test/actors_workers.cpp
@@ -117,7 +117,7 @@ void test_workers(int threads_n, int workers_n, int queries_n, int query_size) {
   std::vector<ActorId<PowerWorker>> workers;
   for (int i = 0; i < workers_n; i++) {
     int thread_id = threads_n ? i % (threads_n - 1) + 2 : 0;
-    workers.push_back(sched.create_actor_unsafe<PowerWorker>(thread_id, "worker" + to_string(i)).release());
+    workers.push_back(sched.create_actor_unsafe<PowerWorker>(thread_id, PSLICE() << "worker" << i).release());
   }
   sched.create_actor_unsafe<Manager>(threads_n ? 1 : 0, "manager", queries_n, query_size, std::move(workers)).release();
 
diff --git a/tddb/td/db/binlog/ConcurrentBinlog.cpp b/tddb/td/db/binlog/ConcurrentBinlog.cpp
index b8a0ec7a3..3a3a3c2e4 100644
--- a/tddb/td/db/binlog/ConcurrentBinlog.cpp
+++ b/tddb/td/db/binlog/ConcurrentBinlog.cpp
@@ -179,8 +179,8 @@ Result<BinlogInfo> ConcurrentBinlog::init(string path, const Callback &callback,
 void ConcurrentBinlog::init_impl(std::unique_ptr<Binlog> binlog, int32 scheduler_id) {
   path_ = binlog->get_path().str();
   last_id_ = binlog->peek_next_id();
-  binlog_actor_ =
-      create_actor_on_scheduler<detail::BinlogActor>("Binlog " + path_, scheduler_id, std::move(binlog), last_id_);
+  binlog_actor_ = create_actor_on_scheduler<detail::BinlogActor>(PSLICE() << "Binlog " << path_, scheduler_id,
+                                                                 std::move(binlog), last_id_);
 }
 
 void ConcurrentBinlog::close_impl(Promise<> promise) {
diff --git a/tdnet/td/net/HttpHeaderCreator.h b/tdnet/td/net/HttpHeaderCreator.h
index d3e84e5db..ffde46f94 100644
--- a/tdnet/td/net/HttpHeaderCreator.h
+++ b/tdnet/td/net/HttpHeaderCreator.h
@@ -45,7 +45,7 @@ class HttpHeaderCreator {
     add_header("Content-Type", type);
   }
   void set_content_size(size_t size) {
-    add_header("Content-Length", to_string(size));
+    add_header("Content-Length", PSLICE() << size);
   }
   void set_keep_alive() {
     add_header("Connection", "keep-alive");
diff --git a/tdnet/td/net/HttpReader.cpp b/tdnet/td/net/HttpReader.cpp
index f67cbd5b8..778d7eaec 100644
--- a/tdnet/td/net/HttpReader.cpp
+++ b/tdnet/td/net/HttpReader.cpp
@@ -70,7 +70,7 @@ Result<size_t> HttpReader::read_next(HttpQuery *query) {
     if (state_ != ReadHeaders) {
       flow_source_.wakeup();
       if (flow_sink_.is_ready() && flow_sink_.status().is_error()) {
-        return Status::Error(400, "Bad Request: " + flow_sink_.status().message().str());
+        return Status::Error(400, PSLICE() << "Bad Request: " << flow_sink_.status().message());
       }
       need_size = flow_source_.get_need_size();
       if (need_size == 0) {
@@ -603,7 +603,7 @@ Status HttpReader::parse_json_parameters(MutableSlice parameters) {
     }
     auto r_key = json_string_decode(parser);
     if (r_key.is_error()) {
-      return Status::Error(400, string("Bad Request: can't parse parameter name: ") + r_key.error().message().c_str());
+      return Status::Error(400, PSLICE() << "Bad Request: can't parse parameter name: " << r_key.error().message());
     }
     parser.skip_whitespaces();
     if (!parser.try_skip(':')) {
@@ -625,8 +625,7 @@ Status HttpReader::parse_json_parameters(MutableSlice parameters) {
       }
     }();
     if (r_value.is_error()) {
-      return Status::Error(400,
-                           string("Bad Request: can't parse parameter value: ") + r_value.error().message().c_str());
+      return Status::Error(400, PSLICE() << "Bad Request: can't parse parameter value: " << r_value.error().message());
     }
     query_->args_.emplace_back(r_key.move_as_ok(), r_value.move_as_ok());
 
@@ -808,7 +807,7 @@ void HttpReader::delete_temp_file(CSlice file_name) {
   if (parent.size() >= prefix_length + 7 &&
       parent.substr(parent.size() - prefix_length - 7, prefix_length) == TEMP_DIRECTORY_PREFIX) {
     LOG(DEBUG) << "Unlink temporary directory " << parent;
-    rmdir(Slice(parent.data(), parent.size() - 1).str()).ignore();
+    rmdir(PSLICE() << Slice(parent.data(), parent.size() - 1)).ignore();
   }
 }
 
diff --git a/tdutils/td/utils/FileLog.cpp b/tdutils/td/utils/FileLog.cpp
index e3c84f171..922be637b 100644
--- a/tdutils/td/utils/FileLog.cpp
+++ b/tdutils/td/utils/FileLog.cpp
@@ -59,7 +59,7 @@ void FileLog::append(CSlice cslice, int log_level) {
   }
 
   if (size_ > rotate_threshold_) {
-    auto status = rename(path_, path_ + ".old");
+    auto status = rename(path_, PSLICE() << path_ << ".old");
     if (status.is_error()) {
       process_fatal_error(status.message());
     }
diff --git a/tdutils/td/utils/Status.h b/tdutils/td/utils/Status.h
index 2b83ab9ee..08edc5354 100644
--- a/tdutils/td/utils/Status.h
+++ b/tdutils/td/utils/Status.h
@@ -150,7 +150,6 @@ class Status {
 #endif
         break;
       default:
-        LOG(FATAL) << "Unknown status type: " << static_cast<int8>(info.error_type);
         UNREACHABLE();
         break;
     }
@@ -218,7 +217,6 @@ class Status {
         return winerror_to_string(info.error_code);
 #endif
       default:
-        LOG(FATAL) << "Unknown status type: " << static_cast<int8>(info.error_type);
         UNREACHABLE();
         return "";
     }
diff --git a/tdutils/td/utils/misc.h b/tdutils/td/utils/misc.h
index b99008aa5..0e221cc74 100644
--- a/tdutils/td/utils/misc.h
+++ b/tdutils/td/utils/misc.h
@@ -235,7 +235,7 @@ std::enable_if_t<std::is_unsigned<T>::value, T> to_integer(Slice str) {
 template <class T>
 Result<T> to_integer_safe(Slice str) {
   auto res = to_integer<T>(str);
-  if (to_string(res) != str) {
+  if ((PSLICE() << res) != str) {
     return Status::Error(PSLICE() << "Can't parse \"" << str << "\" as number");
   }
   return res;
diff --git a/tdutils/td/utils/port/path.cpp b/tdutils/td/utils/port/path.cpp
index 3b688ba3e..f5326918f 100644
--- a/tdutils/td/utils/port/path.cpp
+++ b/tdutils/td/utils/port/path.cpp
@@ -54,7 +54,7 @@ Status mkpath(CSlice path, int32 mode) {
   Status last_error = Status::OK();
   for (size_t i = 1; i < path.size(); i++) {
     if (path[i] == TD_DIR_SLASH) {
-      last_error = mkdir(path.substr(0, i).str(), mode);
+      last_error = mkdir(PSLICE() << path.substr(0, i), mode);
       if (last_error.is_error() && first_error.is_ok()) {
         first_error = last_error.clone();
       }
diff --git a/test/secret.cpp b/test/secret.cpp
index 85a3d3fba..c7d65de79 100644
--- a/test/secret.cpp
+++ b/test/secret.cpp
@@ -616,7 +616,7 @@ class Master : public Actor {
       parent_ = parent.get();
       parent_token_ = parent.token();
       actor_ = create_actor<SecretChatActor>(
-          "SecretChat " + name_, 123,
+          PSLICE() << "SecretChat " << name_, 123,
           std::make_unique<FakeSecretChatContext>(binlog_, key_value_, close_flag_, std::move(parent)), true);
       on_binlog_replay_finish();
     }
@@ -698,7 +698,7 @@ class Master : public Actor {
       key_value_->external_init_finish(binlog_);
 
       actor_ = create_actor<SecretChatActor>(
-          "SecretChat " + name_, 123,
+          PSLICE() << "SecretChat " << name_, 123,
           std::make_unique<FakeSecretChatContext>(binlog_, key_value_, close_flag_,
                                                   ActorShared<Master>(parent_, parent_token_)),
           true);