diff --git a/packages/react/src/tanstackrouter.ts b/packages/react/src/tanstackrouter.ts
index 2efefba49e31..59cb059bfb2d 100644
--- a/packages/react/src/tanstackrouter.ts
+++ b/packages/react/src/tanstackrouter.ts
@@ -41,7 +41,7 @@ export function tanstackRouterBrowserTracingIntegration(
       if (instrumentPageLoad && initialWindowLocation) {
         const matchedRoutes = castRouterInstance.matchRoutes(
           initialWindowLocation.pathname,
-          initialWindowLocation.search,
+          castRouterInstance.options.parseSearch(initialWindowLocation.search),
           { preload: false, throwOnError: false },
         );
 
diff --git a/packages/react/src/vendor/tanstackrouter-types.ts b/packages/react/src/vendor/tanstackrouter-types.ts
index 99a4510228a3..e5eeba71aa87 100644
--- a/packages/react/src/vendor/tanstackrouter-types.ts
+++ b/packages/react/src/vendor/tanstackrouter-types.ts
@@ -29,6 +29,10 @@ SOFTWARE.
 export interface VendoredTanstackRouter {
   history: VendoredTanstackRouterHistory;
   state: VendoredTanstackRouterState;
+  options: {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    parseSearch: (search: string) => Record<string, any>;
+  };
   matchRoutes: (
     pathname: string,
     // eslint-disable-next-line @typescript-eslint/ban-types