diff --git a/telegram-bot-api/Client.cpp b/telegram-bot-api/Client.cpp
index 6c7a6ec..cbb1313 100644
--- a/telegram-bot-api/Client.cpp
+++ b/telegram-bot-api/Client.cpp
@@ -2259,6 +2259,7 @@ class Client::JsonPollOption final : public td::Jsonable {
         default:
           UNREACHABLE();
       }
+      object("addition_date", option_->addition_date_);
     }
   }