diff --git a/litellm/llms/base_llm/guardrail_translation/base_translation.py b/litellm/llms/base_llm/guardrail_translation/base_translation.py
index 6280e636700..f3dd67a2bb9 100644
--- a/litellm/llms/base_llm/guardrail_translation/base_translation.py
+++ b/litellm/llms/base_llm/guardrail_translation/base_translation.py
@@ -31,12 +31,12 @@ class StreamTransformSink:
     single call, not shared state.
     """
 
-    mutated_text_per_choice: Mapping[int, str] = field(default_factory=dict)
-    holdback_per_choice: Mapping[int, int] = field(default_factory=dict)
+    mutated_text_per_choice: dict[int, str] = field(default_factory=dict)
+    holdback_per_choice: dict[int, int] = field(default_factory=dict)
 
     def record(self, texts: Mapping[int, str], holdback: Mapping[int, int]) -> None:
-        self.mutated_text_per_choice = texts
-        self.holdback_per_choice = holdback
+        self.mutated_text_per_choice = dict(texts)
+        self.holdback_per_choice = dict(holdback)
 
 
 @dataclass(frozen=True, slots=True)