diff --git a/aiokdb/__init__.py b/aiokdb/__init__.py
index 5b67e1c..67d1db6 100644
--- a/aiokdb/__init__.py
+++ b/aiokdb/__init__.py
@@ -66,6 +66,7 @@ class Nulls:
     c: str = " "
     e: float = float("nan")
     f: float = float("nan")
+    uu: uuid.UUID = uuid.UUID("00000000-0000-0000-0000-000000000000")
 
 
 class Infs:
diff --git a/aiokdb/server.py b/aiokdb/server.py
index 9fa8add..2b6a161 100644
--- a/aiokdb/server.py
+++ b/aiokdb/server.py
@@ -4,11 +4,17 @@
 import logging
 import os
 import struct
+import sys
 from functools import partial
 from typing import Any, Callable, List, Optional, Tuple
 
 from aiokdb import KException, KObj, MessageType, TypeEnum, b9, d9, krr, logger
 
+if sys.version_info >= (3, 9):
+    AsyncioServer = asyncio.Server
+else:
+    AsyncioServer = Any
+
 
 class CredentialsException(Exception):
     pass
@@ -321,7 +327,7 @@ async def handle_connection(
             pass
 
 
-async def start_qserver(port: int, context: ServerContext) -> Any:
+async def start_qserver(port: int, context: ServerContext) -> AsyncioServer:
     logging.info(f"opening KDB-q IPC server on port {port}")
     server = await asyncio.start_server(partial(handle_connection, context), "", port)
     await context.start_tasks()