diff --git a/litellm/main.py b/litellm/main.py
index 2b53c3a5f..8342ab4d5 100644
--- a/litellm/main.py
+++ b/litellm/main.py
@@ -202,6 +202,7 @@ async def acompletion(
         - If `stream` is True, the function returns an async generator that yields completion lines.
     """
     loop = asyncio.get_event_loop()
+    custom_llm_provider = None
     # Adjusted to use explicit arguments instead of *args and **kwargs
     completion_kwargs = {
         "model": model,
@@ -241,7 +242,7 @@ async def acompletion(
         func_with_context = partial(ctx.run, func)
 
         _, custom_llm_provider, _, _ = get_llm_provider(
-            model=model, api_base=completion_kwargs.get("base_url", None)
+            model=model, api_base=kwargs.get("api_base", None)
         )
 
         if (