diff --git a/freqtrade/optimize/hyperopt.py b/freqtrade/optimize/hyperopt.py
index 3ae975ca7..1dafb483c 100644
--- a/freqtrade/optimize/hyperopt.py
+++ b/freqtrade/optimize/hyperopt.py
@@ -468,6 +468,7 @@ class Hyperopt:
         self.backtesting.exchange._api = None
         self.backtesting.exchange._api_async = None
         self.backtesting.exchange.loop = None  # type: ignore
+        self.backtesting.exchange._loop_lock = None  # type: ignore
         # self.backtesting.exchange = None  # type: ignore
         self.backtesting.pairlists = None  # type: ignore