diff --git a/py/h2o_lightwave/h2o_lightwave/server.py b/py/h2o_lightwave/h2o_lightwave/server.py
index 421e341072..e6ab8bd8c9 100644
--- a/py/h2o_lightwave/h2o_lightwave/server.py
+++ b/py/h2o_lightwave/h2o_lightwave/server.py
@@ -101,7 +101,7 @@ async def _process(self, args: dict):
 
 def _parse_msg(msg: str) -> Optional[dict]:
     # protocol: t addr data
-    parts = msg.split(' ', 3)
+    parts = msg.split(' ', 2)
 
     if len(parts) != 3:
         raise ValueError('Invalid message')