diff --git a/CMakeLists.txt b/CMakeLists.txt
index 33f4cc64e..c80a06397 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -314,6 +314,7 @@ set(TDLIB_SOURCE
   td/telegram/Document.cpp
   td/telegram/DocumentsManager.cpp
   td/telegram/DownloadManager.cpp
+  td/telegram/DownloadManagerCallback.cpp
   td/telegram/DraftMessage.cpp
   td/telegram/FileReferenceManager.cpp
   td/telegram/files/FileBitmask.cpp
diff --git a/td/telegram/DownloadManagerCallback.cpp b/td/telegram/DownloadManagerCallback.cpp
new file mode 100644
index 000000000..13b0b4c78
--- /dev/null
+++ b/td/telegram/DownloadManagerCallback.cpp
@@ -0,0 +1,93 @@
+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2022
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#include "td/telegram/DownloadManagerCallback.h"
+
+#include "td/telegram/FileReferenceManager.h"
+#include "td/telegram/files/FileManager.h"
+#include "td/telegram/Td.h"
+
+#include "td/actor/actor.h"
+#include "td/actor/PromiseFuture.h"
+
+#include "td/utils/common.h"
+#include "td/utils/Status.h"
+
+namespace td {
+
+void DownloadManagerCallback::update_counters(DownloadManager::Counters counters) {
+  send_closure(td_->actor_id(td_), &Td::send_update, counters.get_update_file_downloads_object());
+}
+
+void DownloadManagerCallback::update_file_removed(FileId file_id) {
+  send_closure(td_->actor_id(td_), &Td::send_update,
+               td_api::make_object<td_api::updateFileRemovedFromDownloads>(file_id.get()));
+}
+
+void DownloadManagerCallback::start_file(FileId file_id, int8 priority, ActorShared<DownloadManager> download_manager) {
+  send_closure(td_->file_manager_actor_, &FileManager::download, file_id,
+               make_download_file_callback(td_, std::move(download_manager)), priority,
+               FileManager::KEEP_DOWNLOAD_OFFSET, FileManager::IGNORE_DOWNLOAD_LIMIT);
+}
+
+void DownloadManagerCallback::pause_file(FileId file_id) {
+  send_closure(td_->file_manager_actor_, &FileManager::download, file_id, nullptr, 0, FileManager::KEEP_DOWNLOAD_OFFSET,
+               FileManager::KEEP_DOWNLOAD_LIMIT);
+}
+
+void DownloadManagerCallback::delete_file(FileId file_id) {
+  send_closure(td_->file_manager_actor_, &FileManager::delete_file, file_id, Promise<Unit>(),
+               "download manager callback");
+}
+
+FileId DownloadManagerCallback::dup_file_id(FileId file_id) {
+  return td_->file_manager_->dup_file_id(file_id);
+}
+
+FileView DownloadManagerCallback::get_file_view(FileId file_id) {
+  return td_->file_manager_->get_file_view(file_id);
+}
+
+td_api::object_ptr<td_api::fileDownload> DownloadManagerCallback::get_file_download_object(
+    FileId file_id, FileSourceId file_source_id, int32 add_date, int32 complete_date, bool is_paused) {
+  return td_api::make_object<td_api::fileDownload>(td_->file_manager_->get_file_view(file_id).file_id().get(),
+                                                   td_->file_reference_manager_->get_message_object(file_source_id),
+                                                   add_date, complete_date, is_paused);
+}
+
+std::shared_ptr<FileManager::DownloadCallback> DownloadManagerCallback::make_download_file_callback(
+    Td *td, ActorShared<DownloadManager> download_manager) {
+  class Impl final : public FileManager::DownloadCallback {
+   public:
+    Impl(Td *td, ActorShared<DownloadManager> download_manager)
+        : td_(td), download_manager_(std::move(download_manager)) {
+    }
+    void on_progress(FileId file_id) final {
+      send_update(file_id, false);
+    }
+    void on_download_ok(FileId file_id) final {
+      send_update(file_id, true);
+    }
+    void on_download_error(FileId file_id, Status error) final {
+      send_update(file_id, true);
+    }
+
+   private:
+    Td *td_;
+    ActorShared<DownloadManager> download_manager_;
+
+    void send_update(FileId file_id, bool is_paused) const {
+      auto td = G()->td().get_actor_unsafe();
+      auto file_view = td->file_manager_->get_file_view(file_id);
+      send_closure(download_manager_, &DownloadManager::update_file_download_state, file_id,
+                   file_view.local_total_size(), file_view.size(), is_paused);
+      // TODO: handle deleted state?
+    }
+  };
+  return std::make_shared<Impl>(td, std::move(download_manager));
+}
+
+}  // namespace td
diff --git a/td/telegram/DownloadManagerCallback.h b/td/telegram/DownloadManagerCallback.h
index 4a6c84dd3..d66b77bbf 100644
--- a/td/telegram/DownloadManagerCallback.h
+++ b/td/telegram/DownloadManagerCallback.h
@@ -6,94 +6,48 @@
 //
 #pragma once
 
-#include "td/telegram/FileReferenceManager.h"
+#include "td/telegram/DownloadManager.h"
 #include "td/telegram/files/FileId.h"
-#include "td/telegram/files/FileManager.h"
 #include "td/telegram/files/FileSourceId.h"
 #include "td/telegram/td_api.h"
 
 #include "td/actor/actor.h"
-#include "td/actor/PromiseFuture.h"
 
 #include "td/utils/common.h"
-#include "td/utils/Status.h"
 
 namespace td {
 
+class Td;
+
 class DownloadManagerCallback final : public DownloadManager::Callback {
  public:
   DownloadManagerCallback(Td *td, ActorShared<> parent) : td_(td), parent_(std::move(parent)) {
   }
 
-  void update_counters(DownloadManager::Counters counters) final {
-    send_closure(td_->actor_id(td_), &Td::send_update, counters.get_update_file_downloads_object());
-  }
-  void update_file_removed(FileId file_id) final {
-    send_closure(td_->actor_id(td_), &Td::send_update,
-                 td_api::make_object<td_api::updateFileRemovedFromDownloads>(file_id.get()));
-  }
-  void start_file(FileId file_id, int8 priority, ActorShared<DownloadManager> download_manager) final {
-    send_closure(td_->file_manager_actor_, &FileManager::download, file_id,
-                 make_download_file_callback(td_, std::move(download_manager)), priority,
-                 FileManager::KEEP_DOWNLOAD_OFFSET, FileManager::IGNORE_DOWNLOAD_LIMIT);
-  }
-  void pause_file(FileId file_id) final {
-    send_closure(td_->file_manager_actor_, &FileManager::download, file_id, nullptr, 0,
-                 FileManager::KEEP_DOWNLOAD_OFFSET, FileManager::KEEP_DOWNLOAD_LIMIT);
-  }
-  void delete_file(FileId file_id) final {
-    send_closure(td_->file_manager_actor_, &FileManager::delete_file, file_id, Promise<Unit>(),
-                 "download manager callback");
-  }
-  FileId dup_file_id(FileId file_id) final {
-    return td_->file_manager_->dup_file_id(file_id);
-  }
-  FileView get_file_view(FileId file_id) final {
-    return td_->file_manager_->get_file_view(file_id);
-  }
+  void update_counters(DownloadManager::Counters counters) final;
+
+  void update_file_removed(FileId file_id) final;
+
+  void start_file(FileId file_id, int8 priority, ActorShared<DownloadManager> download_manager) final;
+
+  void pause_file(FileId file_id) final;
+
+  void delete_file(FileId file_id) final;
+
+  FileId dup_file_id(FileId file_id) final;
+
+  FileView get_file_view(FileId file_id) final;
+
   td_api::object_ptr<td_api::fileDownload> get_file_download_object(FileId file_id, FileSourceId file_source_id,
                                                                     int32 add_date, int32 complete_date,
-                                                                    bool is_paused) {
-    return td_api::make_object<td_api::fileDownload>(td_->file_manager_->get_file_view(file_id).file_id().get(),
-                                                     td_->file_reference_manager_->get_message_object(file_source_id),
-                                                     add_date, complete_date, is_paused);
-  }
+                                                                    bool is_paused);
 
  private:
   Td *td_;
   ActorShared<> parent_;
 
   static std::shared_ptr<FileManager::DownloadCallback> make_download_file_callback(
-      Td *td, ActorShared<DownloadManager> download_manager) {
-    class Impl final : public FileManager::DownloadCallback {
-     public:
-      Impl(Td *td, ActorShared<DownloadManager> download_manager)
-          : td_(td), download_manager_(std::move(download_manager)) {
-      }
-      void on_progress(FileId file_id) final {
-        send_update(file_id, false);
-      }
-      void on_download_ok(FileId file_id) final {
-        send_update(file_id, true);
-      }
-      void on_download_error(FileId file_id, Status error) final {
-        send_update(file_id, true);
-      }
-
-     private:
-      Td *td_;
-      ActorShared<DownloadManager> download_manager_;
-
-      void send_update(FileId file_id, bool is_paused) const {
-        auto td = G()->td().get_actor_unsafe();
-        auto file_view = td->file_manager_->get_file_view(file_id);
-        send_closure(download_manager_, &DownloadManager::update_file_download_state, file_id,
-                     file_view.local_total_size(), file_view.size(), is_paused);
-        // TODO: handle deleted state?
-      }
-    };
-    return std::make_shared<Impl>(td, std::move(download_manager));
-  }
+      Td *td, ActorShared<DownloadManager> download_manager);
 };
 
 }  // namespace td