diff --git a/next.config.js b/next.config.js
index fb3b1a2..ca3432a 100644
--- a/next.config.js
+++ b/next.config.js
@@ -20,6 +20,7 @@ const customNextConfig = {
     MAPBOX_ACCESS_TOKEN: process.env.MAPBOX_ACCESS_TOKEN,
     POSTHOG_API_KEY: process.env.POSTHOG_API_KEY,
     SHOW_LINKS_TO_APP: process.env.SHOW_LINKS_TO_APP,
+    SITE_URL: process.env.SITE_URL,
   },
   webpack(config) {
     config.module.rules.push({
diff --git a/src/pages/[projectID]/sitemap.xml.tsx b/src/pages/[projectID]/sitemap.xml.tsx
index 28d9d1c..0b99b47 100644
--- a/src/pages/[projectID]/sitemap.xml.tsx
+++ b/src/pages/[projectID]/sitemap.xml.tsx
@@ -1,13 +1,13 @@
 import type { GetServerSideProps } from 'next';
 import { publicRuntimeConfig } from '../../runtimeConfig';
 
-const { API_URL } = publicRuntimeConfig;
+const { API_URL, SITE_URL } = publicRuntimeConfig;
 
 const PROJECT_LINKS = ['/', '/map', '/compare', '/calculator', '/favorites'];
 
-const generateSiteMap = (host: string, projectId: string, rspos: string[]) => {
+const generateSiteMap = (projectId: string, rspos: string[]) => {
   const wrapURLWithTag = (url: string) => `<url><loc>${url}</loc></url>`;
-  const getFullUrl = (path: string) => `https://${host}/app/${projectId}${path}`;
+  const getFullUrl = (path: string) => `${SITE_URL}/app/${projectId}${path}`;
   const getSchoolPath = (rspo: string) => `/school/${rspo}`;
 
   return `<?xml version="1.0" encoding="UTF-8"?>
@@ -19,8 +19,7 @@ const generateSiteMap = (host: string, projectId: string, rspos: string[]) => {
  `;
 };
 
-export const getServerSideProps: GetServerSideProps = async ({ params, res, req }) => {
-  const host = req.headers.host as string;
+export const getServerSideProps: GetServerSideProps = async ({ params, res }) => {
   const projectId = params?.projectID as string;
 
   const schoolsForProject = await fetch(
@@ -28,7 +27,7 @@ export const getServerSideProps: GetServerSideProps = async ({ params, res, req
   ).then((r) => r.json());
   const rspos = schoolsForProject.map((school) => school.rspo);
 
-  const sitemap = generateSiteMap(host, projectId, rspos);
+  const sitemap = generateSiteMap(projectId, rspos);
 
   res.setHeader('Content-Type', 'text/xml');
   res.write(sitemap);
diff --git a/src/runtimeConfig.ts b/src/runtimeConfig.ts
index eaaa8e3..0af971f 100644
--- a/src/runtimeConfig.ts
+++ b/src/runtimeConfig.ts
@@ -9,6 +9,7 @@ export interface IPublicRuntimeConfig {
   MAPBOX_ACCESS_TOKEN: string;
   POSTHOG_API_KEY: string;
   SHOW_LINKS_TO_APP: string;
+  SITE_URL: string;
 }
 
 const emptyPublicRuntimeConfig: IPublicRuntimeConfig = {
@@ -19,6 +20,7 @@ const emptyPublicRuntimeConfig: IPublicRuntimeConfig = {
   MAPBOX_ACCESS_TOKEN: '',
   POSTHOG_API_KEY: '',
   SHOW_LINKS_TO_APP: '',
+  SITE_URL: '',
 };
 
 export const isFeatureFlagEnabled = (flagValue: string) => flagValue === 'true';