diff --git a/app/controllers/oauth/acge_controller.rb b/app/controllers/oauth/acge_controller.rb
index 73360cf6c..efa5cca08 100644
--- a/app/controllers/oauth/acge_controller.rb
+++ b/app/controllers/oauth/acge_controller.rb
@@ -36,7 +36,7 @@ class Oauth::AcgeController < Oauth::BaseController
             existing_rows = CSV.read("public/操作系统大赛用户信息.csv")
             new_row = [username, email, password, phone, name]
             existing_rows << new_row
-            CSV.open("public/操作系统大赛用户信息.csv", 'w') do |csv| 
+            CSV.open("public/操作系统大赛用户信息.csv", 'wb') do |csv| 
               existing_rows.each { |row| csv << row }
             end
             if reg_result[:message].blank?