diff --git a/src/Http/Controllers/AltSitemapController.php b/src/Http/Controllers/AltSitemapController.php
index 5d80836..c7bc252 100644
--- a/src/Http/Controllers/AltSitemapController.php
+++ b/src/Http/Controllers/AltSitemapController.php
@@ -123,7 +123,7 @@ private function generateEloquentSitemap(Request $request, Fields $fields): Http
             $settings[] = [$taxonomy, $priority];
         }
 
-        $site_url = rtrim(url(''), '/');
+        $site_url = rtrim(config('app.url'), '/');
 
         $entries = $this->getEloquentEntries();
 
@@ -246,7 +246,7 @@ private function generateFlatFileSitemap(Request $request, Fields $fields): Http
             $settings[] = [$taxonomy, $priority];
         }
 
-        $site_url = rtrim(url(''), '/');
+        $site_url = rtrim(config('app.url'), '/');
         $entries = $this->getFlatFileEntries();
 
         $entries = $entries->filter(function ($entry) use ($excludeCollectionFromSitemap) {