diff --git a/stdlib/3/types.pyi b/stdlib/3/types.pyi
index 11ee6004a..73b88899c 100644
--- a/stdlib/3/types.pyi
+++ b/stdlib/3/types.pyi
@@ -113,7 +113,7 @@ if sys.version_info >= (3, 6):
         def athrow(self, val: BaseException) -> Awaitable[_T_co]: ...
         @overload
         def athrow(self, typ: Type[BaseException], val: BaseException, tb: TracebackType = ...) -> Awaitable[_T_co]: ...
-        def aclose(self) -> Awaitable[_T_co]: ...
+        def aclose(self) -> Awaitable[None]: ...
 
 class CoroutineType:
     cr_await: Optional[Any]