diff --git a/spec/lib/file_reverse_reader_spec.rb b/spec/lib/file_reverse_reader_spec.rb
index 169a4e8..264cbd1 100644
--- a/spec/lib/file_reverse_reader_spec.rb
+++ b/spec/lib/file_reverse_reader_spec.rb
@@ -1,3 +1,5 @@
+# coding: utf-8
+
 require "enumerator"
 require 'spec_helper'