diff --git a/.changeset/dehydrated-match-before-load-context-type.md b/.changeset/dehydrated-match-before-load-context-type.md
new file mode 100644
index 00000000000..f3bd7bc5913
--- /dev/null
+++ b/.changeset/dehydrated-match-before-load-context-type.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/router-core': patch
+---
+
+Fix `DehydratedMatch['b']`, which was typed by `RouteMatch['__beforeLoadContext']` — a field tagged `@internal`. This worked fine until `stripInternal` was enabled in fd341ad (PR #4907), which strips `@internal` members from the published `.d.ts` and left this reference dangling since `router-core@1.171.16`. Consumers with `skipLibCheck: false` (the TS default) hit a `tsc` error on `@tanstack/router-core`'s own shipped types. Fixed by giving `b` the declared type of `__beforeLoadContext` instead of indexing into the stripped member.
diff --git a/packages/router-core/src/ssr/types.ts b/packages/router-core/src/ssr/types.ts
index 27bf1118430..b24c7800aec 100644
--- a/packages/router-core/src/ssr/types.ts
+++ b/packages/router-core/src/ssr/types.ts
@@ -3,7 +3,7 @@ import type { MakeRouteMatch } from '../Matches'
 
 export interface DehydratedMatch {
   i: MakeRouteMatch['id']
-  b?: MakeRouteMatch['__beforeLoadContext']
+  b?: Record<string, unknown>
   l?: MakeRouteMatch['loaderData']
   e?: MakeRouteMatch['error']
   u: MakeRouteMatch['updatedAt']