diff --git a/td/telegram/AnimationsManager.cpp b/td/telegram/AnimationsManager.cpp
index b0196f331..f5d103fc9 100644
--- a/td/telegram/AnimationsManager.cpp
+++ b/td/telegram/AnimationsManager.cpp
@@ -445,7 +445,7 @@ void AnimationsManager::on_update_saved_animations_limit() {
   if (G()->close_flag()) {
     return;
   }
-  int32 saved_animations_limit =
+  auto saved_animations_limit =
       narrow_cast<int32>(td_->option_manager_->get_option_integer("saved_animations_limit", 200));
   if (saved_animations_limit != saved_animations_limit_) {
     if (saved_animations_limit > 0) {
diff --git a/td/telegram/ConfigManager.h b/td/telegram/ConfigManager.h
index bf9f7402a..4805fc8e6 100644
--- a/td/telegram/ConfigManager.h
+++ b/td/telegram/ConfigManager.h
@@ -30,8 +30,6 @@ namespace td {
 
 extern int VERBOSITY_NAME(config_recoverer);
 
-class Global;
-
 using SimpleConfig = tl_object_ptr<telegram_api::help_configSimple>;
 struct SimpleConfigResult {
   Result<SimpleConfig> r_config;
diff --git a/td/telegram/Premium.cpp b/td/telegram/Premium.cpp
index 857bcefee..b43df2ccf 100644
--- a/td/telegram/Premium.cpp
+++ b/td/telegram/Premium.cpp
@@ -397,8 +397,8 @@ static string get_premium_source(const td_api::object_ptr<td_api::PremiumSource>
 }
 
 static td_api::object_ptr<td_api::premiumLimit> get_premium_limit_object(Slice key) {
-  int32 default_limit = static_cast<int32>(G()->get_option_integer(PSLICE() << key << "_limit_default"));
-  int32 premium_limit = static_cast<int32>(G()->get_option_integer(PSLICE() << key << "_limit_premium"));
+  auto default_limit = static_cast<int32>(G()->get_option_integer(PSLICE() << key << "_limit_default"));
+  auto premium_limit = static_cast<int32>(G()->get_option_integer(PSLICE() << key << "_limit_premium"));
   if (default_limit <= 0 || premium_limit <= default_limit) {
     return nullptr;
   }
diff --git a/tddb/td/db/SqliteConnectionSafe.h b/tddb/td/db/SqliteConnectionSafe.h
index de99016a4..a8bae2b3c 100644
--- a/tddb/td/db/SqliteConnectionSafe.h
+++ b/tddb/td/db/SqliteConnectionSafe.h
@@ -32,7 +32,7 @@ class SqliteConnectionSafe {
 
  private:
   string path_;
-  std::atomic<uint32> close_state_ = 0;
+  std::atomic<uint32> close_state_{0};
   LazySchedulerLocalStorage<SqliteDb> lsls_connection_;
 };
 
diff --git a/tdnet/td/net/HttpReader.cpp b/tdnet/td/net/HttpReader.cpp
index 8358debb9..416356cde 100644
--- a/tdnet/td/net/HttpReader.cpp
+++ b/tdnet/td/net/HttpReader.cpp
@@ -320,7 +320,7 @@ Result<bool> HttpReader::parse_multipart_form_data(bool can_be_slow) {
               header_value.remove_prefix(10);
               while (true) {
                 header_value = trim(header_value);
-                const char *key_end =
+                const auto *key_end =
                     static_cast<const char *>(std::memchr(header_value.data(), '=', header_value.size()));
                 if (key_end == nullptr) {
                   break;