diff --git a/freqtrade/rpc/api_server/api_backtest.py b/freqtrade/rpc/api_server/api_backtest.py
index 41712632b..26b100408 100644
--- a/freqtrade/rpc/api_server/api_backtest.py
+++ b/freqtrade/rpc/api_server/api_backtest.py
@@ -172,6 +172,7 @@ def api_delete_backtest(ws_mode=Depends(is_webserver_mode)):
             "status_msg": "Backtest running",
         }
     if ApiServer._bt:
+        ApiServer._bt.cleanup()
         del ApiServer._bt
         ApiServer._bt = None
         del ApiServer._bt_data