diff --git a/app/models/hack_set.rb b/app/models/hack_set.rb
index fb37f398c..d9b732dd5 100644
--- a/app/models/hack_set.rb
+++ b/app/models/hack_set.rb
@@ -2,7 +2,7 @@ class HackSet < ApplicationRecord
   validates_length_of :input, maximum: 1000, message: "不能超过1000个字符"
   validates_length_of :output, maximum: 1000, message: "不能超过1000个字符"
   #validates :input, presence: { message: "测试集输入不能为空" }
-  validates :output, presence: { message: "测试集输出不能为空" }
+  validates_presence_of :output, message: "测试集输出不能为空"
   validates_uniqueness_of :input, scope: [:hack_id, :input], message: "多个测试集的输入不能相同"
   # 编程题测试集
   belongs_to :hack