diff --git a/pkg/chassis/config.go b/pkg/chassis/config.go
index c94a50b..57bd4d8 100644
--- a/pkg/chassis/config.go
+++ b/pkg/chassis/config.go
@@ -40,6 +40,7 @@ type (
 		GetSizeInBytes(key string) uint
 		Unmarshal(rawVal interface{}, opts ...viper.DecoderConfigOption) error
 		UnmarshalKey(key string, rawVal interface{}, opts ...viper.DecoderConfigOption) error
+		SetDefault(key string, value any)
 	}
 
 	config struct {