diff --git a/lib/tasks/statistic_subject_info.rake b/lib/tasks/statistic_subject_info.rake
index 165c7d4a6..cab646a73 100644
--- a/lib/tasks/statistic_subject_info.rake
+++ b/lib/tasks/statistic_subject_info.rake
@@ -23,7 +23,7 @@ namespace :subjects do
             "#{data.passed_count}, #{data.course_used_count}, #{data.school_used_count}, " +
             "'#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}', '#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}')")
         buffer_size += 1
-        puts "buffer_size: #{buffer_size}; subject_id: #{subject.id}; subject: #{subject == s.last}; index:#{index+1}"
+        puts "buffer_size: #{buffer_size}; subject_id: #{subject.id}; subject: #{subject == s.last};"
         if buffer_size == 1000 || subject == s.last
           sql = "REPLACE INTO subject_records(#{column_value}) VALUES #{str}"
           puts sql