diff --git a/lib/tfw/server/zmq_websocket_router.py b/lib/tfw/server/zmq_websocket_router.py
index f682f02..cb19c33 100644
--- a/lib/tfw/server/zmq_websocket_router.py
+++ b/lib/tfw/server/zmq_websocket_router.py
@@ -54,7 +54,7 @@ class TFWRouter:
         self.send_to_websockets = send_to_websockets
 
     def route(self, message):
-        scope = Scope(message.get('scope', 'zmq'))
+        scope = Scope(message.pop('scope', 'zmq'))
 
         routing_table = {
             Scope.ZMQ: self.send_to_zmq,