diff --git a/lib/Contributor.php b/lib/Contributor.php
index 6c100a49..c8d93914 100644
--- a/lib/Contributor.php
+++ b/lib/Contributor.php
@@ -172,7 +172,7 @@ class Contributor{
 	/**
 	 * @return array<Contributor>
 	 */
-	public static function GetAllByMarcRole(Enums\MarcRole $marcRole): array{
-		return Db::Query('SELECT * from Contributors where MarcRole = ?', [$marcRole], Contributor::class);
+	public static function GetDistinctByMarcRole(Enums\MarcRole $marcRole): array{
+		return Db::Query('SELECT * from Contributors where MarcRole = ? group by UrlName', [$marcRole], Contributor::class);
 	}
 }
diff --git a/www/sitemap.php b/www/sitemap.php
index 3050381b..bca1afbc 100644
--- a/www/sitemap.php
+++ b/www/sitemap.php
@@ -4,7 +4,7 @@
  */
 
 $ebooks = Ebook::GetAll();
-$authors = Contributor::GetAllByMarcRole(Enums\MarcRole::Author);
+$authors = Contributor::GetDistinctByMarcRole(Enums\MarcRole::Author);
 $collections = Collection::GetAll();
 
 header("Content-Type: application/xml");