diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index c3fe3e601..c4ed75878 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -258,8 +258,8 @@ class Exchange:
                 api.urls['api'] = api.urls['test']
                 logger.info("Enabled Sandbox API on %s", name)
             else:
-                logger.warning(f"No Sandbox URL in CCXT for {name}, exiting. "
-                                "Please check your config.json")
+                logger.warning(
+                    f"No Sandbox URL in CCXT for {name}, exiting. Please check your config.json")
                 raise OperationalException(f'Exchange {name} does not provide a sandbox api')
 
     def _load_async_markets(self, reload: bool = False) -> None: