diff --git a/stdlib/3/typing.pyi b/stdlib/3/typing.pyi
index a7899a4a210c..0cdcba3b247a 100644
--- a/stdlib/3/typing.pyi
+++ b/stdlib/3/typing.pyi
@@ -387,8 +387,7 @@ class IO(Iterator[AnyStr], Generic[AnyStr]):
     def __enter__(self) -> 'IO[AnyStr]': ...
     @abstractmethod
     def __exit__(self, t: Optional[Type[BaseException]], value: Optional[BaseException],
-                 # TODO: traceback should be TracebackType but that's defined in types
-                 traceback: Optional[Any]) -> bool: ...
+                 traceback: Optional[TracebackType]) -> bool: ...
 
 class BinaryIO(IO[bytes]):
     # TODO readinto
diff --git a/stdlib/3/urllib/response.pyi b/stdlib/3/urllib/response.pyi
index 2c16cb679c0a..67c4f193283d 100644
--- a/stdlib/3/urllib/response.pyi
+++ b/stdlib/3/urllib/response.pyi
@@ -1,9 +1,10 @@
 # private module, we only expose what's needed
 
-from typing import BinaryIO, Mapping, Optional
+from io import BufferedRandom
+from typing import Mapping, Optional
 from types import TracebackType
 
-class addinfourl(BinaryIO):
+class addinfourl(BufferedRandom):
     headers = ...  # type: Mapping[str, str]
     url = ...  # type: str
     code = ...  # type: int