diff --git a/metagpt/provider/fireworks_api.py b/metagpt/provider/fireworks_api.py
index 5fe86fc1c..638b0703d 100644
--- a/metagpt/provider/fireworks_api.py
+++ b/metagpt/provider/fireworks_api.py
@@ -85,10 +85,9 @@ class FireworksLLM(OpenAILLM):
         self._init_client()
         self.model = self.config.fireworks_api_model  # `self.model` should after `_make_client` to rewrite it
 
-    def _make_client_kwargs(self) -> (dict, dict):
+    def _make_client_kwargs(self) -> dict:
         kwargs = dict(api_key=self.config.fireworks_api_key, base_url=self.config.fireworks_api_base)
-        async_kwargs = kwargs.copy()
-        return kwargs, async_kwargs
+        return kwargs
 
     def _update_costs(self, usage: CompletionUsage):
         if self.config.calc_usage and usage:
diff --git a/metagpt/provider/open_llm_api.py b/metagpt/provider/open_llm_api.py
index 2893f5b30..976e95c57 100644
--- a/metagpt/provider/open_llm_api.py
+++ b/metagpt/provider/open_llm_api.py
@@ -48,10 +48,9 @@ class OpenLLMGPTAPI(OpenAILLM):
         self._init_client()
         self.model = self.config.open_llm_api_model  # `self.model` should after `_make_client` to rewrite it
 
-    def _make_client_kwargs(self) -> (dict, dict):
+    def _make_client_kwargs(self) -> dict:
         kwargs = dict(api_key="sk-xxx", base_url=self.config.open_llm_api_base)
-        async_kwargs = kwargs.copy()
-        return kwargs, async_kwargs
+        return kwargs
 
     def _calc_usage(self, messages: list[dict], rsp: str) -> CompletionUsage:
         usage = CompletionUsage(prompt_tokens=0, completion_tokens=0, total_tokens=0)