diff --git a/.changeset/funny-onions-grin.md b/.changeset/funny-onions-grin.md
new file mode 100644
index 000000000000..902bcb1aeeaf
--- /dev/null
+++ b/.changeset/funny-onions-grin.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/sitemap': patch
+---
+
+Adds missing `xslURL` property to `SitemapOptions` type.
diff --git a/packages/integrations/sitemap/src/index.ts b/packages/integrations/sitemap/src/index.ts
index 4342ed5dba0b..9bbd39e4a71f 100644
--- a/packages/integrations/sitemap/src/index.ts
+++ b/packages/integrations/sitemap/src/index.ts
@@ -35,6 +35,8 @@ export type SitemapOptions =
 
 			// called for each sitemap item just before to save them on disk, sync or async
 			serialize?(item: SitemapItem): SitemapItem | Promise<SitemapItem | undefined> | undefined;
+
+			xslURL?: string;
 	  }
 	| undefined;