diff --git a/apps/public-site/src/app/book/BookClient.tsx b/apps/public-site/src/app/book/BookClient.tsx
index 04607f6..0fb5fbd 100644
--- a/apps/public-site/src/app/book/BookClient.tsx
+++ b/apps/public-site/src/app/book/BookClient.tsx
@@ -257,7 +257,7 @@ export default function BookClient({ language }: { language: PublicSiteLanguage
       const nextStart = !current.startDate || current.startDate < minStart ? minStart : current.startDate
       const nextEnd = !current.endDate || current.endDate <= nextStart ? minEnd : current.endDate
       if (nextStart === current.startDate && nextEnd === current.endDate) return current
-      return { startDate: nextStart, endDate: nextEnd }
+      return { ...current, startDate: nextStart, endDate: nextEnd }
     })
   }, [vehicle?.nextAvailableAt])