diff --git a/index.ts b/index.ts
index 303f3c0..6a48577 100644
--- a/index.ts
+++ b/index.ts
@@ -4,6 +4,10 @@ import * as xml2js from "xml2js";
 
 const app = new Koa();
 
+function trim(str: string, length: number): string {
+  return str.length <= length ? str : str.slice(0, length - 1) + "…";
+}
+
 app.use(async (ctx) => {
   try {
     const { data } = await Axios.get(
@@ -25,6 +29,10 @@ app.use(async (ctx) => {
         /(<([^>]+)>)/gi,
         ""
       );
+    parsed_data.rss.channel[0]["itunes:subtitle"][0] = trim(
+      parsed_data.rss.channel[0]["itunes:subtitle"][0],
+      255
+    );
 
     for (let i = 0; i < parsed_data.rss.channel[0]["atom:link"].length; i++) {
       const atomLink = parsed_data.rss.channel[0]["atom:link"][i];
@@ -40,8 +48,7 @@ app.use(async (ctx) => {
 
       item["guid"][0].$.isPermaLink = item["guid"][0].$.isPermalink;
       delete item["guid"][0].$.isPermalink;
-      const subtitle = item["itunes:subtitle"][0];
-      subtitle.length < 254 ? subtitle : subtitle.slice(0, 254) + "…";
+      item["itunes:subtitle"][0] = trim(item["itunes:subtitle"][0], 255);
       item["itunes:summary"][0] = item["itunes:summary"][0].replace(
         /(<([^>]+)>)/gi,
         ""