diff --git a/benchmark/bench_db.cpp b/benchmark/bench_db.cpp
index 7fdfde80..51264883 100644
--- a/benchmark/bench_db.cpp
+++ b/benchmark/bench_db.cpp
@@ -10,6 +10,7 @@
 #include "td/db/binlog/ConcurrentBinlog.h"
 #include "td/db/BinlogKeyValue.h"
 #include "td/db/SeqKeyValue.h"
+#include "td/db/SqliteConnectionSafe.h"
 #include "td/db/SqliteDb.h"
 #include "td/db/SqliteKeyValueAsync.h"
 
diff --git a/benchmark/bench_tddb.cpp b/benchmark/bench_tddb.cpp
index 48c81e9c..d997c523 100644
--- a/benchmark/bench_tddb.cpp
+++ b/benchmark/bench_tddb.cpp
@@ -13,6 +13,8 @@
 #include "td/actor/actor.h"
 #include "td/actor/PromiseFuture.h"
 
+#include "td/db/SqliteConnectionSafe.h"
+
 #include "td/utils/benchmark.h"
 #include "td/utils/buffer.h"
 #include "td/utils/common.h"
@@ -77,7 +79,7 @@ class MessagesDbBench : public Benchmark {
   }
 
  private:
-  td::unique_ptr<td::ConcurrentScheduler> scheduler_;
+  td::unique_ptr<ConcurrentScheduler> scheduler_;
   std::shared_ptr<SqliteConnectionSafe> sql_connection_;
   std::shared_ptr<MessagesDbSyncSafeInterface> messages_db_sync_safe_;
   std::shared_ptr<MessagesDbAsyncInterface> messages_db_async_;
diff --git a/td/telegram/DialogDb.cpp b/td/telegram/DialogDb.cpp
index c6890f87..18ebacc2 100644
--- a/td/telegram/DialogDb.cpp
+++ b/td/telegram/DialogDb.cpp
@@ -11,6 +11,7 @@
 #include "td/actor/actor.h"
 #include "td/actor/SchedulerLocalStorage.h"
 
+#include "td/db/SqliteConnectionSafe.h"
 #include "td/db/SqliteDb.h"
 #include "td/db/SqliteKeyValue.h"
 #include "td/db/SqliteStatement.h"
diff --git a/td/telegram/DialogDb.h b/td/telegram/DialogDb.h
index 6422a8a3..ede45031 100644
--- a/td/telegram/DialogDb.h
+++ b/td/telegram/DialogDb.h
@@ -12,8 +12,6 @@
 
 #include "td/actor/PromiseFuture.h"
 
-#include "td/db/SqliteConnectionSafe.h"
-
 #include "td/utils/buffer.h"
 #include "td/utils/common.h"
 #include "td/utils/Status.h"
@@ -22,6 +20,10 @@
 #include <utility>
 
 namespace td {
+
+class SqliteConnectionSafe;
+class SqliteDb;
+
 class DialogDbSyncInterface {
  public:
   DialogDbSyncInterface() = default;
@@ -87,4 +89,5 @@ std::shared_ptr<DialogDbSyncSafeInterface> create_dialog_db_sync(
 
 std::shared_ptr<DialogDbAsyncInterface> create_dialog_db_async(std::shared_ptr<DialogDbSyncSafeInterface> sync_db,
                                                                int32 scheduler_id);
+
 }  // namespace td
diff --git a/td/telegram/MessagesDb.cpp b/td/telegram/MessagesDb.cpp
index 5b497380..f2acc5f6 100644
--- a/td/telegram/MessagesDb.cpp
+++ b/td/telegram/MessagesDb.cpp
@@ -9,6 +9,7 @@
 #include "td/telegram/logevent/LogEvent.h"
 #include "td/telegram/Version.h"
 
+#include "td/db/SqliteConnectionSafe.h"
 #include "td/db/SqliteDb.h"
 #include "td/db/SqliteStatement.h"
 
diff --git a/td/telegram/MessagesDb.h b/td/telegram/MessagesDb.h
index a7ecd15b..88c4592a 100644
--- a/td/telegram/MessagesDb.h
+++ b/td/telegram/MessagesDb.h
@@ -12,8 +12,6 @@
 
 #include "td/actor/PromiseFuture.h"
 
-#include "td/db/SqliteConnectionSafe.h"
-
 #include "td/utils/buffer.h"
 #include "td/utils/common.h"
 #include "td/utils/logging.h"
@@ -24,6 +22,9 @@
 
 namespace td {
 
+class SqliteConnectionSafe;
+class SqliteDb;
+
 // append only before Size
 enum class SearchMessagesFilter : int32 {
   Empty,
diff --git a/td/telegram/TdDb.cpp b/td/telegram/TdDb.cpp
index 60dec784..f61478d3 100644
--- a/td/telegram/TdDb.cpp
+++ b/td/telegram/TdDb.cpp
@@ -18,6 +18,7 @@
 #include "td/db/binlog/Binlog.h"
 #include "td/db/binlog/ConcurrentBinlog.h"
 #include "td/db/BinlogKeyValue.h"
+#include "td/db/SqliteConnectionSafe.h"
 #include "td/db/SqliteKeyValue.h"
 #include "td/db/SqliteKeyValueAsync.h"
 #include "td/db/SqliteKeyValueSafe.h"
diff --git a/td/telegram/files/FileDb.cpp b/td/telegram/files/FileDb.cpp
index 0bd9408a..a7d028df 100644
--- a/td/telegram/files/FileDb.cpp
+++ b/td/telegram/files/FileDb.cpp
@@ -11,6 +11,7 @@
 
 #include "td/actor/actor.h"
 
+#include "td/db/SqliteConnectionSafe.h"
 #include "td/db/SqliteKeyValue.h"
 #include "td/db/SqliteKeyValueSafe.h"
 
diff --git a/test/db.cpp b/test/db.cpp
index f91fa93f..37d4acf2 100644
--- a/test/db.cpp
+++ b/test/db.cpp
@@ -6,6 +6,7 @@
 //
 #include "td/db/binlog/BinlogHelper.h"
 #include "td/db/binlog/ConcurrentBinlog.h"
+#include "td/db/SqliteConnectionSafe.h"
 #include "td/db/BinlogKeyValue.h"
 #include "td/db/SeqKeyValue.h"
 #include "td/db/SqliteKeyValue.h"