diff --git a/crates/ui/src/main.rs b/crates/ui/src/main.rs
index 0dc57dd..be6236d 100644
--- a/crates/ui/src/main.rs
+++ b/crates/ui/src/main.rs
@@ -5,13 +5,12 @@ fn api_base() -> String {
     if let Some(window) = web_sys::window() {
         if let Ok(origin) = window.location().origin() {
             if origin.contains("localhost") || origin.contains("127.0.0.1") {
-                // Local dev: UI on :3300, gateway on :3100
                 if let Ok(hostname) = window.location().hostname() {
                     return format!("http://{}:3100", hostname);
                 }
             }
-            // Production: nginx proxies /catalog, /query, /ai, /storage on same origin
-            return origin;
+            // Production: API proxied under /lakehouse/api/
+            return format!("{}/lakehouse/api", origin);
         }
     }
     "http://localhost:3100".to_string()