diff --git a/mcp-server/dashboard.ts b/mcp-server/dashboard.ts
index 8947267..cc8d005 100644
--- a/mcp-server/dashboard.ts
+++ b/mcp-server/dashboard.ts
@@ -1,4 +1,6 @@
-const GW = window.location.origin;
+// Detect if we're behind nginx (/lakehouse/ prefix) or direct (:3700)
+const base = window.location.pathname.startsWith("/lakehouse") ? "/lakehouse" : "";
+const GW = window.location.origin + base;
 let simData: any = null;
 let currentDay = 0;