diff --git a/src/sitemap.ts b/src/sitemap.ts
index 9f608a2..cefc24a 100644
--- a/src/sitemap.ts
+++ b/src/sitemap.ts
@@ -44,8 +44,15 @@ export function getFormattedSitemap(options: ResolvedOptions, routes: string[])
       priority: getOptionByRoute(options.priority, route) ?? defaultOptions.priority,
       lastmod: getOptionByRoute(options.lastmod, route) ?? defaultOptions.lastmod,
     }
-    if (options.i18n)
-      return Object.assign(formattedSitemap, { link: options.i18n.languages.map(str => ({ lang: str, url: str === options.i18n?.defaultLanguage ? url : `${url}/${str}` })) })
+    if (options.i18n) {
+      const languages = options.i18n.languages.map(str => ({
+        lang: str,
+        url: str === options.i18n?.defaultLanguage ? url : `${url}/${str}`,
+      }))
+      return Object.assign(formattedSitemap, {
+        links: options.i18n.defaultLanguage ? [...languages, { lang: 'x-default', url }] : languages,
+      })
+    }
 
     return formattedSitemap
   })
diff --git a/test/sitemap.test.ts b/test/sitemap.test.ts
index 8de3a49..3c62aa4 100644
--- a/test/sitemap.test.ts
+++ b/test/sitemap.test.ts
@@ -121,7 +121,7 @@ describe('sitemap', () => {
         {
           "changefreq": "daily",
           "lastmod": Any<Date>,
-          "link": [
+          "links": [
             {
               "lang": "fr",
               "url": "http://localhost/route/fr",
@@ -143,7 +143,7 @@ describe('sitemap', () => {
         {
           "changefreq": "daily",
           "lastmod": Any<Date>,
-          "link": [
+          "links": [
             {
               "lang": "fr",
               "url": "http://localhost/route",
@@ -152,6 +152,10 @@ describe('sitemap', () => {
               "lang": "en",
               "url": "http://localhost/route/en",
             },
+            {
+              "lang": "x-default",
+              "url": "http://localhost/route",
+            },
           ],
           "priority": 1,
           "url": "http://localhost/route",