diff --git a/stdlib/3/asyncio/transports.pyi b/stdlib/3/asyncio/transports.pyi
index 10a2dd9b9..863da761f 100644
--- a/stdlib/3/asyncio/transports.pyi
+++ b/stdlib/3/asyncio/transports.pyi
@@ -21,7 +21,7 @@ class ReadTransport(BaseTransport):
 
 class WriteTransport(BaseTransport):
     def set_write_buffer_limits(
-        self, high: int = ..., low: int = ...
+        self, high: Optional[int] = ..., low: Optional[int] = ...
     ) -> None: ...
     def get_write_buffer_size(self) -> int: ...
     def write(self, data: Any) -> None: ...
diff --git a/tests/stubtest_whitelists/py3_common.txt b/tests/stubtest_whitelists/py3_common.txt
index 558520f1b..52652d6f0 100644
--- a/tests/stubtest_whitelists/py3_common.txt
+++ b/tests/stubtest_whitelists/py3_common.txt
@@ -18,7 +18,6 @@ asyncio.Condition.locked
 asyncio.Condition.release
 asyncio.Task.get_stack
 asyncio.Task.print_stack
-asyncio.WriteTransport.set_write_buffer_limits
 asyncio.base_events.BaseEventLoop.subprocess_exec
 asyncio.locks.Condition.acquire
 asyncio.locks.Condition.locked
@@ -27,8 +26,6 @@ asyncio.proactor_events.BaseProactorEventLoop.sock_recv
 asyncio.selector_events.BaseSelectorEventLoop.sock_recv
 asyncio.tasks.Task.get_stack
 asyncio.tasks.Task.print_stack
-asyncio.transports.WriteTransport.set_write_buffer_limits
-asyncio.transports._FlowControlMixin.set_write_buffer_limits
 asyncio.windows_events
 asyncio.windows_utils
 bdb.Bdb.__init__