diff --git a/crawler.go b/crawler.go
index 15fe0db..9ced5a6 100644
--- a/crawler.go
+++ b/crawler.go
@@ -14,6 +14,7 @@ type Crawler interface {
 }
 
 type CrawlerImpl struct {
+	Crawler
 	configs  map[string]interface{}
 	internal Internal
 }