diff --git a/api/core/model_runtime/model_providers/cohere/llm/llm.py b/api/core/model_runtime/model_providers/cohere/llm/llm.py
index 50805bce85..364e4d84ef 100644
--- a/api/core/model_runtime/model_providers/cohere/llm/llm.py
+++ b/api/core/model_runtime/model_providers/cohere/llm/llm.py
@@ -297,7 +297,6 @@ class CohereLargeLanguageModel(LargeLanguageModel):
             chat_history=chat_histories,
             model=real_model,
             stream=stream,
-            return_preamble=True,
             **model_parameters,
         )