diff --git a/website/utils/generateSitemap.ts b/website/utils/generateSitemap.ts
index 0e6ea9ae..2cb94f8e 100644
--- a/website/utils/generateSitemap.ts
+++ b/website/utils/generateSitemap.ts
@@ -156,7 +156,7 @@ function generateSitemapXml(urls: SitemapUrl[]): string {
   const urlEntries = urls
     .map((url) => {
       const alternateLinks = url.alternates
-        ?.map((alt) => `    <link rel="alternate" hreflang="${alt.hreflang}" href="${alt.href}"/>`)
+        ?.map((alt) => `    <xhtml:link rel="alternate" hreflang="${alt.hreflang}" href="${alt.href}"/>`)
         .join("\n");
 
       return `  <url>
@@ -169,7 +169,8 @@ ${alternateLinks || ""}
     .join("\n");
 
   return `<?xml version="1.0" encoding="UTF-8"?>
-<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
+        xmlns:xhtml="http://www.w3.org/1999/xhtml">
 ${urlEntries}
 </urlset>`;
 }