diff --git a/benchmark/bench_http_reader.cpp b/benchmark/bench_http_reader.cpp
index a37c9718c..3babb748a 100644
--- a/benchmark/bench_http_reader.cpp
+++ b/benchmark/bench_http_reader.cpp
@@ -22,7 +22,7 @@ class HttpReaderBench final : public td::Benchmark {
   }
 
   void run(int n) final {
-    int cnt = static_cast<int>(block_size / http_query.size());
+    auto cnt = static_cast<int>(block_size / http_query.size());
     td::HttpQuery q;
     int parsed = 0;
     int sent = 0;
@@ -58,7 +58,7 @@ class BufferBench final : public td::Benchmark {
   }
 
   void run(int n) final {
-    int cnt = static_cast<int>(block_size / http_query.size());
+    auto cnt = static_cast<int>(block_size / http_query.size());
     for (int i = 0; i < n; i += cnt) {
       for (int j = 0; j < cnt; j++) {
         writer_.append(http_query);
@@ -84,7 +84,7 @@ class FindBoundaryBench final : public td::Benchmark {
   }
 
   void run(int n) final {
-    int cnt = static_cast<int>(block_size / http_query.size());
+    auto cnt = static_cast<int>(block_size / http_query.size());
     for (int i = 0; i < n; i += cnt) {
       for (int j = 0; j < cnt; j++) {
         writer_.append(http_query);
diff --git a/benchmark/bench_queue.cpp b/benchmark/bench_queue.cpp
index a442cfb26..f9a724fd3 100644
--- a/benchmark/bench_queue.cpp
+++ b/benchmark/bench_queue.cpp
@@ -591,7 +591,7 @@ class QueueBenchmark2 final : public td::Benchmark {
 
   void server_process(qvalue_t value) {
     int no = value & 0x00FFFFFF;
-    int co = static_cast<int>(static_cast<td::uint32>(value) >> 24);
+    auto co = static_cast<int>(static_cast<td::uint32>(value) >> 24);
     // std::fprintf(stderr, "-->%d %d\n", co, no);
     if (co < 0 || co >= connections_n || no != server_conn[co]++) {
       std::fprintf(stderr, "%d %d\n", co, no);
@@ -632,7 +632,7 @@ class QueueBenchmark2 final : public td::Benchmark {
 
   void client_process(qvalue_t value) {
     int no = value & 0x00FFFFFF;
-    int co = static_cast<int>(static_cast<td::uint32>(value) >> 24);
+    auto co = static_cast<int>(static_cast<td::uint32>(value) >> 24);
     // std::fprintf(stderr, "<--%d %d\n", co, no);
     if (co < 0 || co >= connections_n || no != client_conn[co]++) {
       std::fprintf(stderr, "%d %d\n", co, no);
@@ -733,7 +733,7 @@ class QueueBenchmark final : public td::Benchmark {
     while (active_connections > 0) {
       qvalue_t value = server.get();
       int no = value & 0x00FFFFFF;
-      int co = static_cast<int>(value >> 24);
+      auto co = static_cast<int>(value >> 24);
       // std::fprintf(stderr, "-->%d %d\n", co, no);
       if (co < 0 || co >= connections_n || no != conn[co]++) {
         std::fprintf(stderr, "%d %d\n", co, no);
@@ -764,7 +764,7 @@ class QueueBenchmark final : public td::Benchmark {
     while (active_connections > 0) {
       qvalue_t value = client.get();
       int no = value & 0x00FFFFFF;
-      int co = static_cast<int>(value >> 24);
+      auto co = static_cast<int>(value >> 24);
       // std::fprintf(stderr, "<--%d %d\n", co, no);
       if (co < 0 || co >= connections_n || no != conn[co]++) {
         std::fprintf(stderr, "%d %d\n", co, no);
@@ -797,7 +797,7 @@ class QueueBenchmark final : public td::Benchmark {
       for (int i = 0; i < connections_n; i++) {
         qvalue_t value = client.get();
         int no = value & 0x00FFFFFF;
-        int co = static_cast<int>(value >> 24);
+        auto co = static_cast<int>(value >> 24);
         // std::fprintf(stderr, "<--%d %d\n", co, no);
         if (co < 0 || co >= connections_n || no != conn[co]++) {
           std::fprintf(stderr, "%d %d\n", co, no);
diff --git a/example/java/td_jni.cpp b/example/java/td_jni.cpp
index 7e2974feb..02d142896 100644
--- a/example/java/td_jni.cpp
+++ b/example/java/td_jni.cpp
@@ -50,10 +50,10 @@ static jint Client_nativeClientReceive(JNIEnv *env, jclass clazz, jintArray clie
   auto *manager = get_manager();
   auto response = manager->receive(timeout);
   while (response.object) {
-    jint client_id = static_cast<jint>(response.client_id);
+    auto client_id = static_cast<jint>(response.client_id);
     env->SetIntArrayRegion(client_ids, result_size, 1, &client_id);
 
-    jlong request_id = static_cast<jlong>(response.request_id);
+    auto request_id = static_cast<jlong>(response.request_id);
     env->SetLongArrayRegion(ids, result_size, 1, &request_id);
 
     jobject object;
diff --git a/memprof/memprof.cpp b/memprof/memprof.cpp
index 7277b0bc5..b33d11943 100644
--- a/memprof/memprof.cpp
+++ b/memprof/memprof.cpp
@@ -58,7 +58,7 @@ static int fast_backtrace(void **buffer, int size) {
     void *ip;
   };
 
-  stack_frame *bp = reinterpret_cast<stack_frame *>(get_bp());
+  auto *bp = reinterpret_cast<stack_frame *>(get_bp());
   int i = 0;
   while (i < size &&
 #if TD_LINUX
@@ -153,7 +153,7 @@ std::size_t get_ht_size() {
 
 std::int32_t get_ht_pos(const Backtrace &bt, bool force = false) {
   auto hash = get_hash(bt);
-  std::int32_t pos = static_cast<std::int32_t>(hash % ht.size());
+  auto pos = static_cast<std::int32_t>(hash % ht.size());
   bool was_overflow = false;
   while (true) {
     auto pos_hash = ht[pos].hash.load();
@@ -237,7 +237,7 @@ static void *malloc_with_frame(std::size_t size, const Backtrace &frame) {
 }
 
 static malloc_info *get_info(void *data_void) {
-  char *data = static_cast<char *>(data_void);
+  auto *data = static_cast<char *>(data_void);
   auto *buf = data - RESERVED_SIZE;
 
   auto *info = reinterpret_cast<malloc_info *>(buf);
diff --git a/td/telegram/CallActor.cpp b/td/telegram/CallActor.cpp
index 6b4174878..225ac6605 100644
--- a/td/telegram/CallActor.cpp
+++ b/td/telegram/CallActor.cpp
@@ -457,7 +457,7 @@ void CallActor::on_begin_exchanging_key() {
   call_state_.type = CallState::Type::ExchangingKey;
   call_state_need_flush_ = true;
   int64 call_receive_timeout_ms = G()->shared_config().get_option_integer("call_receive_timeout_ms", 20000);
-  double timeout = static_cast<double>(call_receive_timeout_ms) * 0.001;
+  auto timeout = static_cast<double>(call_receive_timeout_ms) * 0.001;
   LOG(INFO) << "Set call timeout to " << timeout;
   set_timeout_in(timeout);
 }
@@ -636,7 +636,7 @@ void CallActor::try_send_request_query() {
   auto query = G()->net_query_creator().create(tl_query);
   state_ = State::WaitRequestResult;
   int64 call_receive_timeout_ms = G()->shared_config().get_option_integer("call_receive_timeout_ms", 20000);
-  double timeout = static_cast<double>(call_receive_timeout_ms) * 0.001;
+  auto timeout = static_cast<double>(call_receive_timeout_ms) * 0.001;
   LOG(INFO) << "Set call timeout to " << timeout;
   set_timeout_in(timeout);
   query->total_timeout_limit_ = max(timeout, 10.0);
diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index f47191e82..e4d991dd6 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -16389,7 +16389,7 @@ std::pair<int32, vector<DialogId>> MessagesManager::get_recently_opened_dialogs(
 
 vector<DialogId> MessagesManager::sort_dialogs_by_order(const vector<DialogId> &dialog_ids, int32 limit) const {
   CHECK(!td_->auth_manager_->is_bot());
-  int64 fake_order = static_cast<int64>(dialog_ids.size()) + 1;
+  auto fake_order = static_cast<int64>(dialog_ids.size()) + 1;
   auto dialog_dates = transform(dialog_ids, [this, &fake_order](DialogId dialog_id) {
     const Dialog *d = get_dialog(dialog_id);
     CHECK(d != nullptr);
diff --git a/td/telegram/StickersManager.cpp b/td/telegram/StickersManager.cpp
index 92151d7f7..b4fb66d62 100644
--- a/td/telegram/StickersManager.cpp
+++ b/td/telegram/StickersManager.cpp
@@ -6631,7 +6631,7 @@ double StickersManager::get_emoji_language_code_last_difference_time(const strin
     return it->second;
   }
   auto &result = emoji_language_code_last_difference_times_[language_code];
-  int32 old_unix_time = to_integer<int32>(G()->td_db()->get_sqlite_sync_pmc()->get(
+  auto old_unix_time = to_integer<int32>(G()->td_db()->get_sqlite_sync_pmc()->get(
       get_emoji_language_code_last_difference_time_database_key(language_code)));
   int32 passed_time = max(static_cast<int32>(0), G()->unix_time() - old_unix_time);
   result = Time::now_cached() - passed_time;
diff --git a/td/telegram/cli.cpp b/td/telegram/cli.cpp
index f2f1a411f..61205ed52 100644
--- a/td/telegram/cli.cpp
+++ b/td/telegram/cli.cpp
@@ -4314,7 +4314,7 @@ class CliClient final : public Actor {
                    << stats.virtual_size_ << ", peak VSZ = " << stats.virtual_size_peak_;
       }
     } else if (op == "cpu") {
-      uint32 inc_count = to_integer<uint32>(args);
+      auto inc_count = to_integer<uint32>(args);
       while (inc_count-- > 0) {
         cpu_counter_++;
       }
diff --git a/td/telegram/files/FileLoaderUtils.cpp b/td/telegram/files/FileLoaderUtils.cpp
index 4556909a1..a3631a3e7 100644
--- a/td/telegram/files/FileLoaderUtils.cpp
+++ b/td/telegram/files/FileLoaderUtils.cpp
@@ -66,7 +66,7 @@ StringBuilder &operator<<(StringBuilder &sb, const Ext &ext) {
 Result<std::pair<FileFd, string>> open_temp_file(FileType file_type) {
   auto pmc = G()->td_db()->get_binlog_pmc();
   // TODO: CAS?
-  int32 file_id = to_integer<int32>(pmc->get("tmp_file_id"));
+  auto file_id = to_integer<int32>(pmc->get("tmp_file_id"));
   pmc->set("tmp_file_id", to_string(file_id + 1));
 
   auto temp_dir = get_files_temp_dir(file_type);
@@ -94,7 +94,7 @@ bool for_suggested_file_name(CSlice name, bool use_pmc, bool use_random, F &&cal
     }
   } else if (use_pmc) {
     auto pmc = G()->td_db()->get_binlog_pmc();
-    int32 file_id = to_integer<int32>(pmc->get("perm_file_id"));
+    auto file_id = to_integer<int32>(pmc->get("perm_file_id"));
     pmc->set("perm_file_id", to_string(file_id + 1));
     active = callback(PSLICE() << "file_" << file_id << Ext{ext});
     if (active) {
diff --git a/td/telegram/net/NetQueryDispatcher.cpp b/td/telegram/net/NetQueryDispatcher.cpp
index 6329cc055..0660af35b 100644
--- a/td/telegram/net/NetQueryDispatcher.cpp
+++ b/td/telegram/net/NetQueryDispatcher.cpp
@@ -298,7 +298,7 @@ void NetQueryDispatcher::try_fix_migrate(NetQueryPtr &net_query) {
   static constexpr CSlice prefixes[] = {"PHONE_MIGRATE_", "NETWORK_MIGRATE_", "USER_MIGRATE_"};
   for (auto &prefix : prefixes) {
     if (msg.substr(0, prefix.size()) == prefix) {
-      int32 new_main_dc_id = to_integer<int32>(msg.substr(prefix.size()));
+      auto new_main_dc_id = to_integer<int32>(msg.substr(prefix.size()));
       set_main_dc_id(new_main_dc_id);
 
       if (!net_query->dc_id().is_main()) {
diff --git a/td/tl/tl_jni_object.cpp b/td/tl/tl_jni_object.cpp
index 2ce2c073e..5bae3de49 100644
--- a/td/tl/tl_jni_object.cpp
+++ b/td/tl/tl_jni_object.cpp
@@ -213,7 +213,7 @@ std::string fetch_string(JNIEnv *env, jobject o, jfieldID id) {
 
 std::string from_jstring(JNIEnv *env, jstring s) {
   if (!s) {
-    return "";
+    return std::string();
   }
   jsize s_len = env->GetStringLength(s);
   const jchar *p = env->GetStringChars(s, nullptr);
@@ -264,7 +264,7 @@ std::string from_bytes(JNIEnv *env, jbyteArray arr) {
 
 jbyteArray to_bytes(JNIEnv *env, const std::string &b) {
   static_assert(sizeof(char) == sizeof(jbyte), "Mismatched jbyte size");
-  jsize length = narrow_cast<jsize>(b.size());
+  auto length = narrow_cast<jsize>(b.size());
   jbyteArray arr = env->NewByteArray(length);
   if (arr != nullptr && length != 0) {
     env->SetByteArrayRegion(arr, 0, length, reinterpret_cast<const jbyte *>(b.data()));
@@ -274,7 +274,7 @@ jbyteArray to_bytes(JNIEnv *env, const std::string &b) {
 
 jintArray store_vector(JNIEnv *env, const std::vector<std::int32_t> &v) {
   static_assert(sizeof(std::int32_t) == sizeof(jint), "Mismatched jint size");
-  jsize length = narrow_cast<jsize>(v.size());
+  auto length = narrow_cast<jsize>(v.size());
   jintArray arr = env->NewIntArray(length);
   if (arr != nullptr && length != 0) {
     env->SetIntArrayRegion(arr, 0, length, reinterpret_cast<const jint *>(&v[0]));
@@ -284,7 +284,7 @@ jintArray store_vector(JNIEnv *env, const std::vector<std::int32_t> &v) {
 
 jlongArray store_vector(JNIEnv *env, const std::vector<std::int64_t> &v) {
   static_assert(sizeof(std::int64_t) == sizeof(jlong), "Mismatched jlong size");
-  jsize length = narrow_cast<jsize>(v.size());
+  auto length = narrow_cast<jsize>(v.size());
   jlongArray arr = env->NewLongArray(length);
   if (arr != nullptr && length != 0) {
     env->SetLongArrayRegion(arr, 0, length, reinterpret_cast<const jlong *>(&v[0]));
@@ -294,7 +294,7 @@ jlongArray store_vector(JNIEnv *env, const std::vector<std::int64_t> &v) {
 
 jdoubleArray store_vector(JNIEnv *env, const std::vector<double> &v) {
   static_assert(sizeof(double) == sizeof(jdouble), "Mismatched jdouble size");
-  jsize length = narrow_cast<jsize>(v.size());
+  auto length = narrow_cast<jsize>(v.size());
   jdoubleArray arr = env->NewDoubleArray(length);
   if (arr != nullptr && length != 0) {
     env->SetDoubleArrayRegion(arr, 0, length, reinterpret_cast<const jdouble *>(&v[0]));
@@ -303,7 +303,7 @@ jdoubleArray store_vector(JNIEnv *env, const std::vector<double> &v) {
 }
 
 jobjectArray store_vector(JNIEnv *env, const std::vector<std::string> &v) {
-  jsize length = narrow_cast<jsize>(v.size());
+  auto length = narrow_cast<jsize>(v.size());
   jobjectArray arr = env->NewObjectArray(length, StringClass, 0);
   if (arr != nullptr) {
     for (jsize i = 0; i < length; i++) {
diff --git a/td/tl/tl_jni_object.h b/td/tl/tl_jni_object.h
index d2f81b350..b1e7dde5a 100644
--- a/td/tl/tl_jni_object.h
+++ b/td/tl/tl_jni_object.h
@@ -107,7 +107,7 @@ jobjectArray store_vector(JNIEnv *env, const std::vector<std::string> &v);
 
 template <class T>
 jobjectArray store_vector(JNIEnv *env, const std::vector<T> &v) {
-  jint length = static_cast<jint>(v.size());
+  auto length = static_cast<jint>(v.size());
   jobjectArray arr = env->NewObjectArray(length, T::element_type::Class, jobject());
   if (arr != nullptr) {
     for (jint i = 0; i < length; i++) {
@@ -155,7 +155,7 @@ class get_array_class<td_api::pageBlockTableCell> {
 
 template <class T>
 jobjectArray store_vector(JNIEnv *env, const std::vector<std::vector<T>> &v) {
-  jint length = static_cast<jint>(v.size());
+  auto length = static_cast<jint>(v.size());
   jobjectArray arr = env->NewObjectArray(length, get_array_class<typename T::element_type>::get(), 0);
   if (arr != nullptr) {
     for (jint i = 0; i < length; i++) {
diff --git a/tdactor/td/actor/impl/Scheduler.cpp b/tdactor/td/actor/impl/Scheduler.cpp
index 4e32cb33a..74013ab6c 100644
--- a/tdactor/td/actor/impl/Scheduler.cpp
+++ b/tdactor/td/actor/impl/Scheduler.cpp
@@ -435,7 +435,7 @@ void Scheduler::set_actor_timeout_at(ActorInfo *actor_info, double timeout_at) {
 
 void Scheduler::run_poll(Timestamp timeout) {
   // we can't wait for less than 1ms
-  int timeout_ms = static_cast<int32>(clamp(timeout.in(), 0.0, 1000000.0) * 1000 + 1);
+  auto timeout_ms = static_cast<int>(clamp(timeout.in(), 0.0, 1000000.0) * 1000 + 1);
 #if TD_PORT_WINDOWS
   CHECK(inbound_queue_);
   inbound_queue_->reader_get_event_fd().wait(timeout_ms);
diff --git a/tddb/td/db/binlog/Binlog.cpp b/tddb/td/db/binlog/Binlog.cpp
index 9e5215ca8..873cfd6c8 100644
--- a/tddb/td/db/binlog/Binlog.cpp
+++ b/tddb/td/db/binlog/Binlog.cpp
@@ -680,7 +680,7 @@ void Binlog::do_reindex() {
                                              << detail::file_size(new_path) << ' ' << fd_events_ << ' ' << path_;
   }
 
-  double ratio = static_cast<double>(start_size) / static_cast<double>(finish_size + 1);
+  auto ratio = static_cast<double>(start_size) / static_cast<double>(finish_size + 1);
 
   [&](Slice msg) {
     if (start_size > (10 << 20) || finish_time - start_time > 1) {
diff --git a/tdnet/td/net/HttpReader.cpp b/tdnet/td/net/HttpReader.cpp
index 2d2478b27..59d770068 100644
--- a/tdnet/td/net/HttpReader.cpp
+++ b/tdnet/td/net/HttpReader.cpp
@@ -19,6 +19,7 @@
 #include "td/utils/port/path.h"
 #include "td/utils/SliceBuilder.h"
 
+#include <cstddef>
 #include <cstring>
 
 namespace td {
@@ -114,14 +115,14 @@ Result<size_t> HttpReader::read_next(HttpQuery *query, bool can_be_slow) {
             return Status::Error(400, "Bad Request: boundary not found");
           }
           p += 8;
-          ptrdiff_t offset = p - content_type_lowercased_.c_str();
+          std::ptrdiff_t offset = p - content_type_lowercased_.c_str();
           p = static_cast<const char *>(
               std::memchr(content_type_.begin() + offset, '=', content_type_.size() - offset));
           if (p == nullptr) {
             return Status::Error(400, "Bad Request: boundary value not found");
           }
           p++;
-          const char *end_p = static_cast<const char *>(std::memchr(p, ';', content_type_.end() - p));
+          auto end_p = static_cast<const char *>(std::memchr(p, ';', content_type_.end() - p));
           if (end_p == nullptr) {
             end_p = content_type_.end();
           }
diff --git a/tdnet/td/net/SslStream.cpp b/tdnet/td/net/SslStream.cpp
index 614baefc1..a392afbe1 100644
--- a/tdnet/td/net/SslStream.cpp
+++ b/tdnet/td/net/SslStream.cpp
@@ -486,7 +486,7 @@ int strm_read(BIO *b, char *buf, int len) {
   CHECK(stream != nullptr);
   BIO_clear_retry_flags(b);
   CHECK(buf != nullptr);
-  int res = narrow_cast<int>(stream->flow_read(MutableSlice(buf, len)));
+  auto res = narrow_cast<int>(stream->flow_read(MutableSlice(buf, len)));
   if (res == 0) {
     BIO_set_retry_read(b);
     return -1;
diff --git a/tdutils/td/utils/ConcurrentHashTable.h b/tdutils/td/utils/ConcurrentHashTable.h
index fae7a876c..3ecb0ffda 100644
--- a/tdutils/td/utils/ConcurrentHashTable.h
+++ b/tdutils/td/utils/ConcurrentHashTable.h
@@ -57,8 +57,8 @@ class AtomicHashArray {
   template <class F>
   bool with_value(KeyT key, bool should_create, F &&f) {
     DCHECK(key != empty_key());
-    size_t pos = static_cast<size_t>(key) % nodes_.size();
-    size_t n = td::min(td::max(static_cast<size_t>(300), nodes_.size() / 16 + 2), nodes_.size());
+    auto pos = static_cast<size_t>(key) % nodes_.size();
+    auto n = td::min(td::max(static_cast<size_t>(300), nodes_.size() / 16 + 2), nodes_.size());
 
     for (size_t i = 0; i < n; i++) {
       pos++;
diff --git a/tdutils/td/utils/MemoryLog.h b/tdutils/td/utils/MemoryLog.h
index a634a0955..4e837b769 100644
--- a/tdutils/td/utils/MemoryLog.h
+++ b/tdutils/td/utils/MemoryLog.h
@@ -47,8 +47,8 @@ class MemoryLog final : public LogInterface {
     CHECK(slice_size * 3 < buffer_size);
     size_t pad_size = ((slice_size + 15) & ~15) - slice_size;
     constexpr size_t MAGIC_SIZE = 16;
-    uint32 total_size = static_cast<uint32>(slice_size + pad_size + MAGIC_SIZE);
-    uint32 real_pos = pos_.fetch_add(total_size, std::memory_order_relaxed);
+    auto total_size = static_cast<uint32>(slice_size + pad_size + MAGIC_SIZE);
+    auto real_pos = pos_.fetch_add(total_size, std::memory_order_relaxed);
     CHECK((total_size & 15) == 0);
 
     uint32 start_pos = real_pos & (buffer_size - 1);
diff --git a/tdutils/td/utils/StealingQueue.h b/tdutils/td/utils/StealingQueue.h
index 219551b36..4e0aace9e 100644
--- a/tdutils/td/utils/StealingQueue.h
+++ b/tdutils/td/utils/StealingQueue.h
@@ -77,7 +77,7 @@ class StealingQueue {
       if (other_tail < other_head) {
         continue;
       }
-      size_t n = narrow_cast<size_t>(other_tail - other_head);
+      auto n = narrow_cast<size_t>(other_tail - other_head);
       if (n > N) {
         continue;
       }
diff --git a/tdutils/td/utils/StringBuilder.cpp b/tdutils/td/utils/StringBuilder.cpp
index 8454f6887..1ffd33e63 100644
--- a/tdutils/td/utils/StringBuilder.cpp
+++ b/tdutils/td/utils/StringBuilder.cpp
@@ -191,7 +191,7 @@ StringBuilder &StringBuilder::operator<<(FixedDouble x) {
   ss->precision(x.precision);
   *ss << x.d;
 
-  int len = narrow_cast<int>(static_cast<std::streamoff>(ss->tellp()));
+  auto len = narrow_cast<int>(static_cast<std::streamoff>(ss->tellp()));
   auto left = end_ptr_ + RESERVED_SIZE - current_ptr_;
   if (unlikely(len >= left)) {
     error_flag_ = true;
diff --git a/tdutils/td/utils/crypto.cpp b/tdutils/td/utils/crypto.cpp
index 377be86ef..6355c89ef 100644
--- a/tdutils/td/utils/crypto.cpp
+++ b/tdutils/td/utils/crypto.cpp
@@ -466,7 +466,7 @@ class AesIgeStateImpl {
       }
 
       evp_.init_iv(encrypted_iv_.as_slice());
-      int inlen = static_cast<int>(AES_BLOCK_SIZE * count);
+      auto inlen = static_cast<int>(AES_BLOCK_SIZE * count);
       evp_.encrypt(data_xored[0].raw(), data_xored[0].raw(), inlen);
 
       data_xored[0] ^= plaintext_iv_;
@@ -850,7 +850,7 @@ static void pbkdf2_impl(Slice password, Slice salt, int iteration_count, Mutable
   HMAC_CTX ctx;
   HMAC_CTX_init(&ctx);
   unsigned char counter[4] = {0, 0, 0, 1};
-  int password_len = narrow_cast<int>(password.size());
+  auto password_len = narrow_cast<int>(password.size());
   HMAC_Init_ex(&ctx, password.data(), password_len, evp_md, nullptr);
   HMAC_Update(&ctx, salt.ubegin(), narrow_cast<int>(salt.size()));
   HMAC_Update(&ctx, counter, 4);
diff --git a/tdutils/td/utils/find_boundary.cpp b/tdutils/td/utils/find_boundary.cpp
index b71755d70..32fbe6bf0 100644
--- a/tdutils/td/utils/find_boundary.cpp
+++ b/tdutils/td/utils/find_boundary.cpp
@@ -33,7 +33,7 @@ bool find_boundary(ChainBufferReader range, Slice boundary, size_t &already_read
       range.advance(1);
       already_read++;
     } else {
-      const char *ptr = static_cast<const char *>(std::memchr(ready.data(), boundary[0], ready.size()));
+      const auto *ptr = static_cast<const char *>(std::memchr(ready.data(), boundary[0], ready.size()));
       size_t shift;
       if (ptr == nullptr) {
         shift = ready.size();
diff --git a/tdutils/td/utils/port/IPAddress.cpp b/tdutils/td/utils/port/IPAddress.cpp
index cf4e317b7..38be8ed0c 100644
--- a/tdutils/td/utils/port/IPAddress.cpp
+++ b/tdutils/td/utils/port/IPAddress.cpp
@@ -86,7 +86,7 @@ static void punycode(string &result, Slice part) {
 
       if (code == next_n) {
         // found next symbol, encode delta
-        int left = static_cast<int>(delta);
+        auto left = static_cast<int>(delta);
         while (true) {
           bias += 36;
           auto t = clamp(bias, 1, 26);
diff --git a/tdutils/td/utils/tl_parsers.h b/tdutils/td/utils/tl_parsers.h
index a7141d263..e0fb668f8 100644
--- a/tdutils/td/utils/tl_parsers.h
+++ b/tdutils/td/utils/tl_parsers.h
@@ -178,7 +178,7 @@ class TlParser {
     if (!error.empty()) {
       return T();
     }
-    const char *result = reinterpret_cast<const char *>(data);
+    auto result = reinterpret_cast<const char *>(data);
     data += size;
     return T(result, size);
   }
diff --git a/tdutils/test/StealingQueue.cpp b/tdutils/test/StealingQueue.cpp
index fc878fb58..64fca0e16 100644
--- a/tdutils/test/StealingQueue.cpp
+++ b/tdutils/test/StealingQueue.cpp
@@ -131,9 +131,9 @@ TEST(StealingQueue, simple) {
       for (td::uint64 round = 1; round < 1000; round++) {
         if (id == 0) {
           sum = 0;
-          int n = static_cast<int>(rnd() % 5);
+          auto n = static_cast<int>(rnd() % 5);
           for (int j = 0; j < n; j++) {
-            int x = static_cast<int>(rnd() % XN);
+            auto x = static_cast<int>(rnd() % XN);
             sum += x_sum[x];
             gq.push(x, id);
           }
diff --git a/tdutils/test/bitmask.cpp b/tdutils/test/bitmask.cpp
index 1c7a5280b..6ace35354 100644
--- a/tdutils/test/bitmask.cpp
+++ b/tdutils/test/bitmask.cpp
@@ -78,8 +78,8 @@ class RangeSet {
 
       CHECK(it.begin % BIT_SIZE == 0);
       CHECK(it.end % BIT_SIZE == 0);
-      uint32 begin = narrow_cast<uint32>(it.begin / BIT_SIZE);
-      uint32 end = narrow_cast<uint32>(it.end / BIT_SIZE);
+      auto begin = narrow_cast<uint32>(it.begin / BIT_SIZE);
+      auto end = narrow_cast<uint32>(it.end / BIT_SIZE);
       if (sizes.empty()) {
         if (begin != 0) {
           sizes.push_back(0);