diff --git a/services/article.ts b/services/article.ts
index 71ee1b1..3c6ec94 100644
--- a/services/article.ts
+++ b/services/article.ts
@@ -120,7 +120,7 @@ export async function updateArticle(id: string, data: any) {
   return await httpPut(pathUrl, headers, data);
 }
 
-export async function getArticleById(id: any, timeStamp: any) {
+export async function getArticleById(id: any, timeStamp?: any) {
   const headers = {
     "content-type": "application/json",
   };