diff --git a/aiodocker/execs.py b/aiodocker/execs.py
index 859c3709..c18acaf5 100644
--- a/aiodocker/execs.py
+++ b/aiodocker/execs.py
@@ -3,6 +3,7 @@
 import json
 from typing import (
     TYPE_CHECKING,
+    Any,
     Dict,
     Literal,
     Optional,
@@ -77,7 +78,12 @@ async def start(
     ) -> bytes:
         pass
 
-    def start(self, *, timeout=None, detach=False):
+    def start(
+        self,
+        *,
+        timeout: aiohttp.ClientTimeout | None = None,
+        detach: bool = False,
+    ) -> Any:
         """
         Start this exec instance.
         Args:
diff --git a/aiodocker/stream.py b/aiodocker/stream.py
index 1c538e62..fedd8803 100644
--- a/aiodocker/stream.py
+++ b/aiodocker/stream.py
@@ -22,6 +22,8 @@ class Message(NamedTuple):
 
 
 class Stream:
+    _resp: aiohttp.ClientResponse | None
+
     def __init__(
         self,
         docker: "Docker",
@@ -132,8 +134,9 @@ async def __aexit__(
         exc_typ: Type[BaseException],
         exc_val: BaseException,
         exc_tb: TracebackType,
-    ) -> None:
+    ) -> Optional[bool]:
         await self.close()
+        return None
 
     def __del__(self, _warnings=warnings) -> None:
         if self._resp is not None: