diff --git a/lib/fluent/plugin/buf_file.rb b/lib/fluent/plugin/buf_file.rb
index 163d1e1f5a..46670ab24f 100644
--- a/lib/fluent/plugin/buf_file.rb
+++ b/lib/fluent/plugin/buf_file.rb
@@ -170,10 +170,14 @@ def resume
       def generate_chunk(metadata)
         # FileChunk generates real path with unique_id
         if @file_permission
-          Fluent::Plugin::Buffer::FileChunk.new(metadata, @path, :create, perm: @file_permission, compress: @compress)
+          chunk = Fluent::Plugin::Buffer::FileChunk.new(metadata, @path, :create, perm: @file_permission, compress: @compress)
         else
-          Fluent::Plugin::Buffer::FileChunk.new(metadata, @path, :create, compress: @compress)
+          chunk = Fluent::Plugin::Buffer::FileChunk.new(metadata, @path, :create, compress: @compress)
         end
+
+        log.debug "Created new chunk", chunk_id: dump_unique_id_hex(chunk.unique_id), metadata: metadata
+
+        return chunk
       end
     end
   end