diff --git a/telegram-bot-api/Client.cpp b/telegram-bot-api/Client.cpp
index 5badda4..d708db7 100644
--- a/telegram-bot-api/Client.cpp
+++ b/telegram-bot-api/Client.cpp
@@ -11326,9 +11326,21 @@ td::Status Client::process_pin_chat_message_query(PromisedQueryPtr &query) {
 }
 
 td::Status Client::process_unpin_chat_message_query(PromisedQueryPtr &query) {
+  auto business_connection_id = query->arg("business_connection_id");
   auto chat_id = query->arg("chat_id");
   auto message_id = get_message_id(query.get());
 
+  if (!business_connection_id.empty()) {
+    check_business_connection_chat_id(
+        business_connection_id.str(), chat_id.str(), std::move(query),
+        [this, message_id](const BusinessConnection *business_connection, int64 chat_id, PromisedQueryPtr query) {
+          send_request(
+              make_object<td_api::setBusinessMessageIsPinned>(business_connection->id_, chat_id, message_id, false),
+              td::make_unique<TdOnOkQueryCallback>(std::move(query)));
+        });
+    return td::Status::OK();
+  }
+
   if (message_id == 0) {
     check_chat(chat_id, AccessRights::Write, std::move(query), [this](int64 chat_id, PromisedQueryPtr query) {
       send_request(make_object<td_api::getChatPinnedMessage>(chat_id),