diff --git a/aiogram/contrib/middlewares/logging.py b/aiogram/contrib/middlewares/logging.py
index 308d0e10..985a2ca2 100644
--- a/aiogram/contrib/middlewares/logging.py
+++ b/aiogram/contrib/middlewares/logging.py
@@ -10,7 +10,7 @@ HANDLED_STR = ['Unhandled', 'Handled']
 
 class LoggingMiddleware(BaseMiddleware):
     def __init__(self, logger=__name__):
-        if not isinstance(logger, logging.Logger):
+        if isinstance(logger, str):
             logger = logging.getLogger(logger)
 
         self.logger = logger