diff --git a/aio_request/aiohttp.py b/aio_request/aiohttp.py
index d2e77eb..d451e67 100644
--- a/aio_request/aiohttp.py
+++ b/aio_request/aiohttp.py
@@ -140,7 +140,6 @@ async def _resolve(self) -> None:
 class AioHttpTransport(Transport):
     __slots__ = (
         "__client_session",
-        "_metrics_provider",
         "__network_errors_code",
         "__too_many_redirects_code",
         "__buffer_payload",