diff --git a/td/telegram/files/FileManager.cpp b/td/telegram/files/FileManager.cpp
index 06a93900a..8636ee1c2 100644
--- a/td/telegram/files/FileManager.cpp
+++ b/td/telegram/files/FileManager.cpp
@@ -1704,7 +1704,7 @@ Result<FileId> FileManager::merge(FileId x_file_id, FileId y_file_id, bool no_sy
     node->on_info_changed();
   }
 
-  if (node->file_ids_.size() > (1u << file_node_size_warning_exp_)) {
+  if (node->file_ids_.size() > (static_cast<size_t>(1) << file_node_size_warning_exp_)) {
     LOG(WARNING) << "File of type " << file_view.get_type() << " has " << node->file_ids_.size() << " file identifiers";
     file_node_size_warning_exp_++;
   }