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..cf0dc5c 100644
--- a/aiokdb/server.py
+++ b/aiokdb/server.py
@@ -321,7 +321,7 @@ async def handle_connection(
             pass
 
 
-async def start_qserver(port: int, context: ServerContext) -> Any:
+async def start_qserver(port: int, context: ServerContext) -> asyncio.Server:
     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()