diff --git a/scripts/ws_client.py b/scripts/ws_client.py
index 233a7828a..ee6faccbf 100755
--- a/scripts/ws_client.py
+++ b/scripts/ws_client.py
@@ -190,7 +190,7 @@ class ClientProtocol:
             self.logger.info("Empty DataFrame")
 
     async def _handle_default(self, name, msgtype, data):
-        self.logger.info("Unknown message of type {msgtype} received...")
+        self.logger.info(f"Unknown message of type {msgtype} received...")
         self.logger.info(data)