diff --git a/truss-train/truss_train/definitions.py b/truss-train/truss_train/definitions.py
index fef319306..d121a5ce4 100644
--- a/truss-train/truss_train/definitions.py
+++ b/truss-train/truss_train/definitions.py
@@ -125,7 +125,7 @@ def validate_cache_config(cls, values):
             raise ValueError(
                 "Cannot set both 'enable_cache' and 'cache_config'. "
                 "'enable_cache' is deprecated. Prefer migrating to 'cache_config' with "
-                "`enabled=True` and `enable_legacy_hf_cache=True`."
+                "`enabled=True` and `enable_legacy_hf_mount=True`."
             )
 
         # Migrate enable_cache to cache_config if enable_cache is True