diff --git a/packages/react/src/vendor/tanstackrouter-types.ts b/packages/react/src/vendor/tanstackrouter-types.ts
index e5eeba71aa87..417d2b1447b1 100644
--- a/packages/react/src/vendor/tanstackrouter-types.ts
+++ b/packages/react/src/vendor/tanstackrouter-types.ts
@@ -46,7 +46,7 @@ export interface VendoredTanstackRouter {
     eventType: 'onResolved' | 'onBeforeNavigate',
     callback: (stateUpdate: {
       toLocation: VendoredTanstackRouterLocation;
-      fromLocation: VendoredTanstackRouterLocation;
+      fromLocation?: VendoredTanstackRouterLocation;
     }) => void,
   ): () => void;
 }