diff --git a/sorteerhoed/webserver.py b/sorteerhoed/webserver.py
index ace4874..2543afc 100644
--- a/sorteerhoed/webserver.py
+++ b/sorteerhoed/webserver.py
@@ -248,7 +248,7 @@ class ConfigWebSocketHandler(tornado.websocket.WebSocketHandler):
         parsed_origin = urlparse(origin)
         # parsed_origin.netloc.lower() gives localhost:3333
         valid = any([parsed_origin.hostname.endswith(origin) for origin in self.CORS_ORIGINS])
-        logger.info(f"Connection from {origin} is valid? {valid=}")
+        logger.info(f"Connection from {origin} is valid? valid: {valid}")
         return valid
 
     # the client connected