diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index 3ad5f17..68cf2de 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -17,7 +17,7 @@ export const metadata = {
   title: "Kris McGinnes Portfolio",
   description:
     "I most enjoy building software at the intersection of design and engineering - things that look good but are also built well under the hood.",
-  metadataBase: new URL(env.SITE_URL),
+  metadataBase: env.SITE_URL && new URL(env.SITE_URL),
 }
 
 export default function RootLayout({
diff --git a/src/env.js b/src/env.js
index c85edd5..2f3409c 100644
--- a/src/env.js
+++ b/src/env.js
@@ -8,7 +8,7 @@ export const env = createEnv({
    */
   server: {
     NODE_ENV: z.enum(["development", "test", "production"]),
-    SITE_URL: z.string().url(),
+    SITE_URL: z.string().url().optional(),
   },
 
   /**