diff --git a/src/bentoml/_internal/configuration/containers.py b/src/bentoml/_internal/configuration/containers.py
index 88aa29b6559..b35d17e3e26 100644
--- a/src/bentoml/_internal/configuration/containers.py
+++ b/src/bentoml/_internal/configuration/containers.py
@@ -96,7 +96,7 @@ def __init__(
             )
             # Running migration layer if it exists
             if migration is not None:
-                override = migration(
+                override_config_json = migration(
                     default_config=self.config,
                     override_config=dict(flatten_dict(override_config_json)),
                 )