diff --git a/stdlib/asyncio/base_events.pyi b/stdlib/asyncio/base_events.pyi
index 4613581e2..02aff1ac2 100644
--- a/stdlib/asyncio/base_events.pyi
+++ b/stdlib/asyncio/base_events.pyi
@@ -14,6 +14,10 @@ from typing_extensions import Literal
 if sys.version_info >= (3, 7):
     from contextvars import Context
 
+    __all__ = ("BaseEventLoop",)
+else:
+    __all__ = ["BaseEventLoop"]
+
 _T = TypeVar("_T")
 _ProtocolT = TypeVar("_ProtocolT", bound=BaseProtocol)
 _Context = dict[str, Any]