diff --git a/freqtrade/optimize/backtesting.py b/freqtrade/optimize/backtesting.py
index aabd835dd..fe458acb5 100644
--- a/freqtrade/optimize/backtesting.py
+++ b/freqtrade/optimize/backtesting.py
@@ -964,7 +964,7 @@ class Backtesting:
 
     def trade_slot_available(self, open_trade_count: int) -> bool:
         # Always allow trades when max_open_trades is enabled.
-        max_open_trades: IntOrInf = self.config['max_open_trades']
+        max_open_trades: IntOrInf = self.strategy.max_open_trades
         if max_open_trades <= 0 or open_trade_count < max_open_trades:
             return True
         # Rejected trade