diff --git a/stdlib/2/__builtin__.pyi b/stdlib/2/__builtin__.pyi
index aaa2aedbc..d778c0519 100644
--- a/stdlib/2/__builtin__.pyi
+++ b/stdlib/2/__builtin__.pyi
@@ -29,6 +29,7 @@ class classmethod: pass  # Special, only valid as a decorator.
 class object:
     __doc__ = ...  # type: Optional[str]
     __class__ = ...  # type: type
+    __slots__ = ...  # type: Optional[Union[str, unicode, Iterable[Union[str, unicode]]]]
 
     def __init__(self) -> None: ...
     def __new__(cls) -> Any: ...
diff --git a/stdlib/3.4/asyncio/events.pyi b/stdlib/3.4/asyncio/events.pyi
index a7d9c4d28..15328e532 100644
--- a/stdlib/3.4/asyncio/events.pyi
+++ b/stdlib/3.4/asyncio/events.pyi
@@ -13,7 +13,6 @@ AF_UNSPEC = 0     # from socket
 AI_PASSIVE = 0
 
 class Handle:
-    __slots__ = ... # type: List[str]
     _cancelled = False
     _args = ... # type: List[Any]
     def __init__(self, callback: Callable[..., Any], args: List[Any],
diff --git a/stdlib/3.4/asyncio/futures.pyi b/stdlib/3.4/asyncio/futures.pyi
index 22d97bdaf..1ce319764 100644
--- a/stdlib/3.4/asyncio/futures.pyi
+++ b/stdlib/3.4/asyncio/futures.pyi
@@ -15,7 +15,6 @@ from concurrent.futures import (
 class InvalidStateError(Error): ...
 
 class _TracebackLogger:
-    __slots__ = ... # type: List[str]
     exc = ...  # type: BaseException
     tb = ... # type: List[str]
     def __init__(self, exc: Any, loop: AbstractEventLoop) -> None: ...
diff --git a/stdlib/3/builtins.pyi b/stdlib/3/builtins.pyi
index 27d64632d..ca83395a8 100644
--- a/stdlib/3/builtins.pyi
+++ b/stdlib/3/builtins.pyi
@@ -32,6 +32,7 @@ class object:
     __doc__ = ...  # type: Optional[str]
     __class__ = ...  # type: type
     __dict__ = ...  # type: Dict[str, Any]
+    __slots__ = ...  # type: Optional[Union[str, Iterable[str]]]
 
     def __init__(self) -> None: ...
     def __new__(cls) -> Any: ...