diff --git a/src/SitemapGenerator.php b/src/SitemapGenerator.php
index e0b9185..097c6e4 100644
--- a/src/SitemapGenerator.php
+++ b/src/SitemapGenerator.php
@@ -119,7 +119,7 @@ public function getSitemap(): Sitemap
 
         $this->crawler
             ->setCrawlProfile($this->getCrawlProfile())
-            ->setCrawlObserver($this->getCrawlObserver())
+            ->addCrawlObserver($this->getCrawlObserver())
             ->setConcurrency($this->concurrency)
             ->startCrawling($this->urlToBeCrawled);