diff --git a/src/monarch_mcp_custom/server.py b/src/monarch_mcp_custom/server.py
index 2290e5d..e628cf3 100644
--- a/src/monarch_mcp_custom/server.py
+++ b/src/monarch_mcp_custom/server.py
@@ -200,7 +200,7 @@ def create_app():
         Route("/mcp/messages", endpoint=sse.handle_post_message, methods=["POST"]),
     ]
 
-    return Starlette(routes=routes, lifespan=mcp.lifespan)
+    return Starlette(routes=routes, lifespan=mcp._lifespan)
 
 
 app = create_app()