diff --git a/app/views/courses/left_banner.json.jbuilder b/app/views/courses/left_banner.json.jbuilder
index b53dbbb79..efc40f5ef 100644
--- a/app/views/courses/left_banner.json.jbuilder
+++ b/app/views/courses/left_banner.json.jbuilder
@@ -30,6 +30,7 @@ json.course_modules @course_modules.each do |mod|
 
           json.third_category category.children do |child|
             json.partial! "category_info", category: child
+            json.parent_id child.parent_id
           end
         end
     end