diff --git a/app/controllers/student_works_controller.rb b/app/controllers/student_works_controller.rb
index 15b59e863..9eec32521 100644
--- a/app/controllers/student_works_controller.rb
+++ b/app/controllers/student_works_controller.rb
@@ -44,7 +44,7 @@ class StudentWorksController < ApplicationController
     # 统一设置的作业取所有学生，否则取已发布的分班学生
     students = @homework.unified_setting? ? @course.students : @course.students.where(course_group_id: @homework.published_settings.pluck(:course_group_id))
     unless params[:search].blank?
-      @members = students.joins(user: :user_extensions).where("user_id != #{current_user.id} and (concat(users.lastname, users.firstname)
+      @members = students.joins(user: :user_extension).where("user_id != #{current_user.id} and (concat(users.lastname, users.firstname)
                   like ? or user_extensions.student_id like ?)", "%#{params[:search]}%", "%#{params[:search]}%")
     else