diff --git a/llama_stack/providers/inline/memory/faiss/config.py b/llama_stack/providers/inline/memory/faiss/config.py
index 94e33766a..d82104477 100644
--- a/llama_stack/providers/inline/memory/faiss/config.py
+++ b/llama_stack/providers/inline/memory/faiss/config.py
@@ -20,7 +20,7 @@ class FaissImplConfig(BaseModel):
     kvstore: KVStoreConfig
 
     @classmethod
-    def sample_run_config(cls, __distro_dir__) -> Dict[str, Any]:
+    def sample_run_config(cls, __distro_dir__: str) -> Dict[str, Any]:
         return {
             "kvstore": SqliteKVStoreConfig.sample_run_config(
                 __distro_dir__=__distro_dir__,