diff --git a/impl/impl.go b/impl/impl.go
index 7f7b3b6..949d365 100644
--- a/impl/impl.go
+++ b/impl/impl.go
@@ -11,6 +11,8 @@ func New(name, impl string) *Impl {
 	switch impl {
 	case "units.throttler.Throttler":
 		return Throttler(name)
+	case "units.rule_filter.RuleFilter":
+		return Echo(name)
 	default:
 		return nil
 	}