diff --git a/freqtrade/rpc/api_server/api_schemas.py b/freqtrade/rpc/api_server/api_schemas.py
index 0977511a9..7e7787672 100644
--- a/freqtrade/rpc/api_server/api_schemas.py
+++ b/freqtrade/rpc/api_server/api_schemas.py
@@ -557,7 +557,7 @@ class __DecimalParameter(__RealParameter):
 class __BooleanParameter(__StrategyParameter):
     param_type: Literal["BooleanParameter"]
     value: Any
-    opt_range: list[Any]
+    opt_range: list[bool]
 
 
 class __CategoricalParameter(__StrategyParameter):