diff --git a/freqtrade/optimize/hyperopt/hyperopt_auto.py b/freqtrade/optimize/hyperopt/hyperopt_auto.py
index 30b649ccd..603d0b139 100644
--- a/freqtrade/optimize/hyperopt/hyperopt_auto.py
+++ b/freqtrade/optimize/hyperopt/hyperopt_auto.py
@@ -42,6 +42,13 @@ class HyperOptAuto(IHyperOpt):
     sell_indicator_space methods, but other hyperopt methods can be overridden as well.
     """
 
+    def get_available_spaces(self) -> list[str]:
+        """
+        Get list of available spaces defined in strategy.
+        :return: list of available spaces.
+        """
+        return list(self.strategy._ft_hyper_params)
+
     def _get_func(self, name) -> Callable:
         """
         Return a function defined in Strategy.HyperOpt class, or one defined in super() class.
diff --git a/freqtrade/optimize/hyperopt/hyperopt_optimizer.py b/freqtrade/optimize/hyperopt/hyperopt_optimizer.py
index 390b535d4..167559f9d 100644
--- a/freqtrade/optimize/hyperopt/hyperopt_optimizer.py
+++ b/freqtrade/optimize/hyperopt/hyperopt_optimizer.py
@@ -223,9 +223,7 @@ class HyperOptimizer:
         Assign the dimensions in the hyperoptimization space.
         """
         spaces = ["buy", "sell", "protection", "roi", "stoploss", "trailing", "trades"]
-        spaces += [
-            s for s in self.config["spaces"] if s not in spaces and s not in ("all", "default")
-        ]
+        spaces += [s for s in self.custom_hyperopt.get_available_spaces() if s not in spaces]
 
         for space in spaces:
             if not HyperoptTools.has_space(self.config, space):