diff --git a/stdlib/3.4/asyncio/subprocess.pyi b/stdlib/3.4/asyncio/subprocess.pyi
index bd7fd941f..a2592894f 100644
--- a/stdlib/3.4/asyncio/subprocess.pyi
+++ b/stdlib/3.4/asyncio/subprocess.pyi
@@ -19,7 +19,7 @@ class SubprocessStreamProtocol(streams.FlowControlMixin,
     def __init__(self, limit: int, loop: events.AbstractEventLoop) -> None: ...
     def connection_made(self, transport: transports.BaseTransport) -> None: ...
     def pipe_data_received(self, fd: int, data: AnyStr) -> None: ...
-    def pipe_connection_lost(self, fd: int, exc: Exception): ...
+    def pipe_connection_lost(self, fd: int, exc: Exception) -> None: ...
     def process_exited(self) -> None: ...