diff --git a/core/http/request.go b/core/http/request.go
index 0201f1e..bf3b34a 100644
--- a/core/http/request.go
+++ b/core/http/request.go
@@ -130,7 +130,8 @@ func webAPIRequest(context context.Context, URL, token string) HttpResponse {
 	}
 
 	if !(300 > resp2.StatusCode && resp2.StatusCode >= 200) {
-		fmt.Println("non-2xx response from pixiv:", URL, resp2.StatusCode, resp2.Body)
+		// class:warn
+		log.Println("non-2xx response from pixiv:", URL, resp2.StatusCode, resp2.Body)
 	}
 
 	return resp2