diff --git a/configuration.py b/configuration.py
index e2cf0622..4377eb8f 100644
--- a/configuration.py
+++ b/configuration.py
@@ -90,6 +90,9 @@ def __init__(self):
         # When set to `None`, will default to whatever urllib3 uses
         self.connection_pool_maxsize = None
 
+        # WebSocket subprotocol to use for exec and portforward.
+        self.ws_streaming_protocol = "v4.channel.k8s.io"
+
     @property
     def logger_file(self):
         """