diff --git a/litellm/llms/anthropic.py b/litellm/llms/anthropic.py
index 4a9aabc22a7..5b5ed3f831e 100644
--- a/litellm/llms/anthropic.py
+++ b/litellm/llms/anthropic.py
@@ -160,7 +160,7 @@ class AnthropicChatCompletion(BaseLLM):
         logging_obj: litellm.utils.Logging,
         optional_params: dict,
         api_key: str,
-        data: dict | str,
+        data: Union[dict, str],
         messages: List,
         print_verbose,
         encoding,