diff --git a/lib/tfw/components/pipe_io_event_handler.py b/lib/tfw/components/pipe_io_event_handler.py
index 04cb634..ef162c9 100644
--- a/lib/tfw/components/pipe_io_event_handler.py
+++ b/lib/tfw/components/pipe_io_event_handler.py
@@ -21,7 +21,7 @@ class PipeIOEventHandlerBase(EventHandlerBase):
         self.pipe_io.start()
 
     @abstractmethod
-    def handle_pipe_event(self, message):
+    def handle_pipe_event(self, message_bytes):
         raise NotImplementedError()
 
     def cleanup(self):
@@ -42,6 +42,6 @@ class PipeIOEventHandler(PipeIOEventHandlerBase):
         json_bytes = dumps(message).encode()
         self.pipe_io.send_message(json_bytes)
 
-    def handle_pipe_event(self, message):
-        json = loads(message)
+    def handle_pipe_event(self, message_bytes):
+        json = loads(message_bytes)
         self.server_connector.send(json)