diff --git a/stdlib/3/asyncio/events.pyi b/stdlib/3/asyncio/events.pyi
index d3c811949..6dd516134 100644
--- a/stdlib/3/asyncio/events.pyi
+++ b/stdlib/3/asyncio/events.pyi
@@ -317,7 +317,7 @@ class BaseDefaultEventLoopPolicy(AbstractEventLoopPolicy, metaclass=ABCMeta):
     def new_event_loop(self) -> AbstractEventLoop: ...
 
 def get_event_loop_policy() -> AbstractEventLoopPolicy: ...
-def set_event_loop_policy(policy: AbstractEventLoopPolicy) -> None: ...
+def set_event_loop_policy(policy: Optional[AbstractEventLoopPolicy]) -> None: ...
 
 def get_event_loop() -> AbstractEventLoop: ...
 def set_event_loop(loop: Optional[AbstractEventLoop]) -> None: ...