diff --git a/packages/web/components/ProfileViewer.tsx b/packages/web/components/ProfileViewer.tsx
index 633d4eb..83545c5 100644
--- a/packages/web/components/ProfileViewer.tsx
+++ b/packages/web/components/ProfileViewer.tsx
@@ -86,7 +86,9 @@ export function ProfileViewer() {
   const [isLoadingFile, setIsLoadingFile] = useState(false);
 
   const API_BASE = typeof window !== "undefined"
-    ? ((window as unknown as { NEXT_PUBLIC_API_URL?: string }).NEXT_PUBLIC_API_URL || "http://localhost:8000")
+    ? (typeof window !== "undefined" && (window as { location?: { hostname?: string } }).location?.hostname === "localhost" 
+       ? "http://localhost:8000" 
+       : (window as { env?: { NEXT_PUBLIC_API_URL?: string } }).env?.NEXT_PUBLIC_API_URL || "/")
     : "http://localhost:8000";
 
   async function fetchAndDisplayFile(path: string, name: string) {