diff --git a/packages/start/server/types.tsx b/packages/start/server/types.tsx
index feb685df7..39571ae62 100644
--- a/packages/start/server/types.tsx
+++ b/packages/start/server/types.tsx
@@ -74,13 +74,15 @@ declare global {
   }
 }
 
+export interface LocalsExt {}
+
 export interface FetchEvent {
   request: Request;
   httpServer?: Server;
   env: Env;
   fetch(url: string, init?: RequestInit): Promise<Response>;
   clientAddress: string;
-  locals: Record<string, unknown>;
+  locals: Record<string, unknown> & LocalsExt;
 }
 
 export interface ServerFunctionEvent extends FetchEvent {