diff --git a/nanobot/providers/registry.py b/nanobot/providers/registry.py
index ecf092f..2766929 100644
--- a/nanobot/providers/registry.py
+++ b/nanobot/providers/registry.py
@@ -147,7 +147,7 @@ PROVIDERS: tuple[ProviderSpec, ...] = (
         keywords=("volcengine", "volces", "ark"),
         env_key="OPENAI_API_KEY",
         display_name="VolcEngine",
-        litellm_prefix="openai",
+        litellm_prefix="volcengine",
         skip_prefixes=(),
         env_extras=(),
         is_gateway=True,