diff --git a/src/invidious/helpers/serialized_yt_data.cr b/src/invidious/helpers/serialized_yt_data.cr
index 4df72f65..a9798f0c 100644
--- a/src/invidious/helpers/serialized_yt_data.cr
+++ b/src/invidious/helpers/serialized_yt_data.cr
@@ -237,6 +237,7 @@ class Category
 
   def to_json(locale, json : JSON::Builder)
     json.object do
+      json.field "type", "category"
       json.field "title", self.title
       json.field "contents" do
         json.array do