diff --git a/aiogram/types/base.py b/aiogram/types/base.py
index a3e6f0eb..0ed8579c 100644
--- a/aiogram/types/base.py
+++ b/aiogram/types/base.py
@@ -231,7 +231,7 @@ class TelegramObject(ContextInstanceMixin, metaclass=MetaTelegramObject):
         self.values[key] = value
 
         # Log warning when Telegram silently adds new Fields
-        log.warning(f"Field '%s' doesn't exist in %s", key, self.__class__)
+        log.warning("Field '%s' doesn't exist in %s", key, self.__class__)
 
     def __contains__(self, item: str) -> bool:
         """