diff --git a/package.json b/package.json
index 835b15f61c7e..59bffe17290d 100644
--- a/package.json
+++ b/package.json
@@ -38,8 +38,8 @@
     "canary:publish": "yarn lerna publish from-package --dist-tag canary --yes --no-verify-access",
     "changelog": "lerna-changelog",
     "postinstall": "yarn lock:update && yarn build:packages",
-    "prettier": "prettier --config .prettierrc --write \"**/*.{js,ts}\"",
-    "prettier:diff": "prettier --config .prettierrc --list-different \"**/*.{js,ts}\"",
+    "prettier": "prettier --config .prettierrc --write \"**/*.{js,jsx,ts,tsx}\"",
+    "prettier:diff": "prettier --config .prettierrc --list-different \"**/*.{js,jsx,ts,tsx}\"",
     "prettier-docs": "prettier --config .prettierrc --write \"**/*.md\"",
     "lint": "yarn lint:js && yarn lint:style",
     "lint:js": "eslint --cache \"**/*.{js,jsx,ts,tsx}\"",
diff --git a/packages/docusaurus-plugin-sitemap/package.json b/packages/docusaurus-plugin-sitemap/package.json
index 7e2579adefed..489cc788390f 100644
--- a/packages/docusaurus-plugin-sitemap/package.json
+++ b/packages/docusaurus-plugin-sitemap/package.json
@@ -19,6 +19,7 @@
   "dependencies": {
     "@docusaurus/core": "2.0.0-alpha.70",
     "@docusaurus/types": "2.0.0-alpha.70",
+    "@docusaurus/utils": "2.0.0-alpha.70",
     "fs-extra": "^9.0.1",
     "joi": "^17.2.1",
     "sitemap": "^3.2.2"
diff --git a/packages/docusaurus-plugin-sitemap/src/createSitemap.ts b/packages/docusaurus-plugin-sitemap/src/createSitemap.ts
index 3a29dda1cdaf..63f137febd05 100644
--- a/packages/docusaurus-plugin-sitemap/src/createSitemap.ts
+++ b/packages/docusaurus-plugin-sitemap/src/createSitemap.ts
@@ -8,6 +8,7 @@
 import sitemap, {Sitemap, SitemapItemOptions} from 'sitemap';
 import {PluginOptions} from './types';
 import {DocusaurusConfig} from '@docusaurus/types';
+import {addTrailingSlash} from '@docusaurus/utils';
 
 export default function createSitemap(
   siteConfig: DocusaurusConfig,
@@ -23,8 +24,8 @@ export default function createSitemap(
   const urls = routesPaths
     .filter((route) => !route.endsWith('404.html'))
     .map(
-      (routesPath): SitemapItemOptions => ({
-        url: `${routesPath}${trailingSlash && !routesPath.endsWith('/') ? '/' : ''}`,
+      (routePath): SitemapItemOptions => ({
+        url: trailingSlash ? addTrailingSlash(routePath) : routePath,
         changefreq,
         priority,
       }),