diff --git a/td/telegram/ContactsManager.cpp b/td/telegram/ContactsManager.cpp
index 1266a1af7..9900d635a 100644
--- a/td/telegram/ContactsManager.cpp
+++ b/td/telegram/ContactsManager.cpp
@@ -7496,7 +7496,7 @@ void ContactsManager::on_get_channel_participants_success(
             bot_user_ids.push_back(participant.user_id);
           }
         }
-        administrator_count = administrator_user_ids.size();
+        administrator_count = narrow_cast<int32>(administrator_user_ids.size());
       } else if (filter.is_administrators()) {
         administrator_user_ids = std::move(user_ids);
       } else if (filter.is_bots()) {