diff --git a/td/mtproto/SessionConnection.cpp b/td/mtproto/SessionConnection.cpp
index b86167a4..4845eb47 100644
--- a/td/mtproto/SessionConnection.cpp
+++ b/td/mtproto/SessionConnection.cpp
@@ -186,7 +186,7 @@ class OnPacket {
 
 /*** SessionConnection ***/
 BufferSlice SessionConnection::as_buffer_slice(Slice packet) {
-  return current_buffer_slice->from_slice(packet);
+  return current_buffer_slice_->from_slice(packet);
 }
 
 Status SessionConnection::parse_message(TlParser &parser, MsgInfo *info, Slice *packet, bool crypto_flag) {
@@ -694,9 +694,8 @@ void SessionConnection::on_read(size_t size) {
   last_read_at_ = Time::now_cached();
 }
 
-SessionConnection::SessionConnection(Mode mode, unique_ptr<RawConnection> raw_connection, AuthData *auth_data,
-                                     DhCallback *dh_callback)
-    : raw_connection_(std::move(raw_connection)), auth_data_(auth_data), dh_callback_(dh_callback) {
+SessionConnection::SessionConnection(Mode mode, unique_ptr<RawConnection> raw_connection, AuthData *auth_data)
+    : raw_connection_(std::move(raw_connection)), auth_data_(auth_data) {
   state_ = Init;
   mode_ = mode;
   created_at_ = Time::now();
diff --git a/td/mtproto/SessionConnection.h b/td/mtproto/SessionConnection.h
index 7e86e33f..f45ac700 100644
--- a/td/mtproto/SessionConnection.h
+++ b/td/mtproto/SessionConnection.h
@@ -65,7 +65,7 @@ class SessionConnection
     , private RawConnection::Callback {
  public:
   enum class Mode { Tcp, Http, HttpLongPoll };
-  SessionConnection(Mode mode, unique_ptr<RawConnection> raw_connection, AuthData *auth_data, DhCallback *dh_callback);
+  SessionConnection(Mode mode, unique_ptr<RawConnection> raw_connection, AuthData *auth_data);
 
   PollableFdInfo &get_poll_info();
 
@@ -194,16 +194,15 @@ class SessionConnection
   unique_ptr<RawConnection> raw_connection_;
   AuthData *auth_data_;
   SessionConnection::Callback *callback_ = nullptr;
-  DhCallback *dh_callback_;
-  BufferSlice *current_buffer_slice;
+  BufferSlice *current_buffer_slice_;
 
   friend class OnPacket;
 
   BufferSlice as_buffer_slice(Slice packet);
   auto set_buffer_slice(BufferSlice *buffer_slice) TD_WARN_UNUSED_RESULT {
-    auto old_buffer_slice = current_buffer_slice;
-    current_buffer_slice = buffer_slice;
-    return ScopeExit() + [&to = current_buffer_slice, from = old_buffer_slice] { to = from; };
+    auto old_buffer_slice = current_buffer_slice_;
+    current_buffer_slice_ = buffer_slice;
+    return ScopeExit() + [&to = current_buffer_slice_, from = old_buffer_slice] { to = from; };
   }
 
   Status parse_message(TlParser &parser, MsgInfo *info, Slice *packet, bool crypto_flag = true) TD_WARN_UNUSED_RESULT;
diff --git a/td/telegram/net/Session.cpp b/td/telegram/net/Session.cpp
index 0a78c12c..d7842810 100644
--- a/td/telegram/net/Session.cpp
+++ b/td/telegram/net/Session.cpp
@@ -963,8 +963,7 @@ void Session::connection_open_finish(ConnectionInfo *info,
   auto name = PSTRING() << get_name() << "::Connect::" << mode_name << "::" << raw_connection->debug_str_;
   LOG(INFO) << "connection_open_finish: " << name;
   //LOG(ERROR) << "connection_open_finish: " << name;
-  info->connection =
-      make_unique<mtproto::SessionConnection>(mode, std::move(raw_connection), &auth_data_, DhCache::instance());
+  info->connection = make_unique<mtproto::SessionConnection>(mode, std::move(raw_connection), &auth_data_);
   info->connection->set_online(connection_online_flag_, is_main_);
   info->connection->set_name(name);
   Scheduler::subscribe(info->connection->get_poll_info().extract_pollable_fd(this));