diff --git a/packages/router-core/src/ssr/transformStreamWithRouter.ts b/packages/router-core/src/ssr/transformStreamWithRouter.ts
index 8322b8da880..e0170ce02ec 100644
--- a/packages/router-core/src/ssr/transformStreamWithRouter.ts
+++ b/packages/router-core/src/ssr/transformStreamWithRouter.ts
@@ -238,6 +238,7 @@ export function transformStreamWithRouter(
 
         finalPassThrough.write(processed)
         leftover = chunkString.slice(lastIndex)
+        leftoverHtml = ''
       } else {
         leftover = chunkString
         leftoverHtml += getBufferedRouterStream()