diff --git a/lib/env-entry.ts b/lib/env-entry.ts
index 3e4daf9..8d2c27d 100644
--- a/lib/env-entry.ts
+++ b/lib/env-entry.ts
@@ -1,7 +1,7 @@
 import { getClientEnv, getServerEnv } from "./env"
 import type { EnvKey } from "./env"
 
-export default function getEnv(key: EnvKey): string {
+export default function getEnv(key: EnvKey): string | undefined {
   if (key.startsWith("NEXT_PUBLIC_")) {
     const clientKey = key.replace("NEXT_PUBLIC_", "") as any
     return getClientEnv(clientKey)