diff --git a/td/telegram/Td.cpp b/td/telegram/Td.cpp
index 3fc99d66..e30b7e47 100644
--- a/td/telegram/Td.cpp
+++ b/td/telegram/Td.cpp
@@ -97,18 +97,6 @@
 #include <type_traits>
 
 namespace td {
-namespace {
-DbKey as_db_key(string key) {
-  // Database will still be effectively not encrypted, but
-  // 1. sqlite db will be protected from corruption, because that's how sqlcipher works
-  // 2. security through obscurity
-  // 3. no need for reencryption of sqlite db
-  if (key.empty()) {
-    return DbKey::raw_key("cucumber");
-  }
-  return DbKey::raw_key(std::move(key));
-}
-}  // namespace
 
 void Td::ResultHandler::set_td(Td *new_td) {
   CHECK(td == nullptr);
@@ -3208,6 +3196,17 @@ td_api::object_ptr<td_api::AuthorizationState> Td::get_fake_authorization_state_
   }
 }
 
+DbKey Td::as_db_key(string key) {
+  // Database will still be effectively not encrypted, but
+  // 1. sqlite db will be protected from corruption, because that's how sqlcipher works
+  // 2. security through obscurity
+  // 3. no need for reencryption of sqlite db
+  if (key.empty()) {
+    return DbKey::raw_key("cucumber");
+  }
+  return DbKey::raw_key(std::move(key));
+}
+
 void Td::request(uint64 id, tl_object_ptr<td_api::Function> function) {
   if (id == 0) {
     LOG(ERROR) << "Ignore request with id == 0: " << to_string(function);
@@ -3516,10 +3515,6 @@ void Td::on_authorization_lost() {
   destroy();
 }
 
-static td_api::object_ptr<td_api::error> make_error(int32 code, CSlice error) {
-  return td_api::make_object<td_api::error>(code, error.str());
-}
-
 void Td::start_up() {
   always_wait_for_mailbox();
 
diff --git a/td/telegram/Td.h b/td/telegram/Td.h
index d63e3fc5..e18d22d1 100644
--- a/td/telegram/Td.h
+++ b/td/telegram/Td.h
@@ -939,12 +939,17 @@ class Td final : public NetQueryCallback {
   static td_api::object_ptr<td_api::Object> do_static_request(const td_api::getLanguagePackString &request);
   static td_api::object_ptr<td_api::Object> do_static_request(const td_api::testSetLogTagVerbosityLevel &request);
 
+  static DbKey as_db_key(string key);
   Status init(DbKey key) TD_WARN_UNUSED_RESULT;
   void clear();
   void close_impl(bool destroy_flag);
-  Status fix_parameters(TdParameters &parameters) TD_WARN_UNUSED_RESULT;
+  static Status fix_parameters(TdParameters &parameters) TD_WARN_UNUSED_RESULT;
   Status set_parameters(td_api::object_ptr<td_api::tdlibParameters> parameters) TD_WARN_UNUSED_RESULT;
 
+  static td_api::object_ptr<td_api::error> make_error(int32 code, CSlice error) {
+    return td_api::make_object<td_api::error>(code, error.str());
+  }
+
   // Actor
   void start_up() override;
   void tear_down() override;