diff --git a/llama_stack/providers/registry/post_training.py b/llama_stack/providers/registry/post_training.py
index 5c93a2e22..67238e3fc 100644
--- a/llama_stack/providers/registry/post_training.py
+++ b/llama_stack/providers/registry/post_training.py
@@ -32,7 +32,7 @@ def available_providers() -> list[ProviderSpec]:
                 "provider_type": "inline::torchtune-cpu",
                 "pip_packages": (
                     cast(list[str], torchtune_def["pip_packages"])
-                    + ["torch torchtune>=0.5.0 torchao>=0.12.0 --index-url https://download.pytorch.org/whl/cpu"]
+                    + ["torch torchtune>=0.5.0 torchao>=0.12.0 --extra-index-url https://download.pytorch.org/whl/cpu"]
                 ),
             },
         ),