diff --git a/llama_stack/providers/utils/scoring/base_scoring_fn.py b/llama_stack/providers/utils/scoring/base_scoring_fn.py
index 56ec4dfae..26ba816c4 100644
--- a/llama_stack/providers/utils/scoring/base_scoring_fn.py
+++ b/llama_stack/providers/utils/scoring/base_scoring_fn.py
@@ -20,6 +20,7 @@ class BaseScoringFn(ABC):
 
     def __init__(self, *args, **kwargs) -> None:
         super().__init__(*args, **kwargs)
+        self.supported_fn_defs_registry = {}
 
     def __str__(self) -> str:
         return self.__class__.__name__