diff --git a/app/jobs/course_delete_student_delete_works_job.rb b/app/jobs/course_delete_student_delete_works_job.rb
index 9bdb93b87..c12762fbe 100644
--- a/app/jobs/course_delete_student_delete_works_job.rb
+++ b/app/jobs/course_delete_student_delete_works_job.rb
@@ -4,7 +4,7 @@ class CourseDeleteStudentDeleteWorksJob < ApplicationJob
   def perform(course_id, student_ids)
     course = Course.find_by(id: course_id)
     return if course.blank?
-    course = self.course
+
     student_works = StudentWork.joins(:homework_common).where(user_id: student_ids, homework_commons: {course_id: course.id})
     student_works.update_all(is_delete: 1)