diff --git a/db/migrate/20200102030945_modify_course_group_for_courses.rb b/db/migrate/20200102030945_modify_course_group_for_courses.rb
index f613023c8..6e71af35b 100644
--- a/db/migrate/20200102030945_modify_course_group_for_courses.rb
+++ b/db/migrate/20200102030945_modify_course_group_for_courses.rb
@@ -10,7 +10,7 @@ class ModifyCourseGroupForCourses < ActiveRecord::Migration[5.2]
           cg.homework_group_reviews.update_all(course_group_id: g.id)
           cg.homework_group_settings.update_all(course_group_id: g.id)
           cg.teacher_course_groups.update_all(course_group_id: g.id)
-          cg.destory!
+          cg.destroy!
         end
       end
     end