diff --git a/Telegram/SourceFiles/history/history_inner_widget.h b/Telegram/SourceFiles/history/history_inner_widget.h
index 0da2dc7657..c3e256c3f9 100644
--- a/Telegram/SourceFiles/history/history_inner_widget.h
+++ b/Telegram/SourceFiles/history/history_inner_widget.h
@@ -256,7 +256,8 @@ private:
 
 	using ChosenReaction = HistoryView::Reactions::ChosenReaction;
 	using VideoUserpic = Dialogs::Ui::VideoUserpic;
-	using SelectedItems = std::map<HistoryItem*, TextSelection, std::less<>>;
+	using SelectedItems
+		= base::flat_map<HistoryItem*, TextSelection, std::less<>>;
 	enum class MouseAction {
 		None,
 		PrepareDrag,
diff --git a/Telegram/SourceFiles/menu/menu_item_download_files.cpp b/Telegram/SourceFiles/menu/menu_item_download_files.cpp
index 10423c6e07..01a990b11b 100644
--- a/Telegram/SourceFiles/menu/menu_item_download_files.cpp
+++ b/Telegram/SourceFiles/menu/menu_item_download_files.cpp
@@ -237,7 +237,7 @@ void AddDownloadFilesAction(
 void AddDownloadFilesAction(
 		not_null<Ui::PopupMenu*> menu,
 		not_null<Window::SessionController*> window,
-		const std::map<HistoryItem*, TextSelection, std::less<>> &items,
+		const base::flat_map<HistoryItem*, TextSelection, std::less<>> &items,
 		not_null<HistoryInner*> list) {
 	if (items.empty()) {
 		return;
diff --git a/Telegram/SourceFiles/menu/menu_item_download_files.h b/Telegram/SourceFiles/menu/menu_item_download_files.h
index 91e270b716..896d66fe3a 100644
--- a/Telegram/SourceFiles/menu/menu_item_download_files.h
+++ b/Telegram/SourceFiles/menu/menu_item_download_files.h
@@ -35,7 +35,7 @@ void AddDownloadFilesAction(
 	not_null<Ui::PopupMenu*> menu,
 	not_null<Window::SessionController*> window,
 	// From the legacy history inner widget.
-	const std::map<HistoryItem*, TextSelection, std::less<>> &items,
+	const base::flat_map<HistoryItem*, TextSelection, std::less<>> &items,
 	not_null<HistoryInner*> list);
 
 } // namespace Menu