diff --git a/inline_article.go b/inline_article.go
index 91e045b..69700d3 100644
--- a/inline_article.go
+++ b/inline_article.go
@@ -56,7 +56,7 @@ func (r ArticleResult) MarshalJSON() ([]byte, error) {
 	}
 
 	if r.ThumbURL != "" {
-		props["thumb_url"] = r.URL
+		props["thumb_url"] = r.ThumbURL
 	}
 
 	if r.HideURL {