diff --git a/src/mcp/server/stdio.py b/src/mcp/server/stdio.py
index e526bab56..1367d03c0 100644
--- a/src/mcp/server/stdio.py
+++ b/src/mcp/server/stdio.py
@@ -64,6 +64,9 @@ async def stdin_reader():
 
                     session_message = SessionMessage(message)
                     await read_stream_writer.send(session_message)
+                # EOF reached - stdin closed, parent process likely died
+                # Signal shutdown by closing the write stream
+                await read_stream_writer.aclose()
         except anyio.ClosedResourceError:  # pragma: no cover
             await anyio.lowlevel.checkpoint()