diff --git a/src/lib/geventwebsocket/handler.py b/src/lib/geventwebsocket/handler.py
index be681cee..c40b03c1 100644
--- a/src/lib/geventwebsocket/handler.py
+++ b/src/lib/geventwebsocket/handler.py
@@ -126,7 +126,7 @@ class WebSocketHandler(WSGIHandler):
 
         if self.request_version != 'HTTP/1.1':
             self.start_response('402 Bad Request', [])
-            self.logger.warning("Bad server protocol in headers")
+            self.logger.warning("Bad server protocol in headers: %s" % self.request_version)
 
             return ['Bad protocol version']