diff --git a/index.ts b/index.ts
index 31acf2a..b161ab4 100644
--- a/index.ts
+++ b/index.ts
@@ -47,8 +47,9 @@ app.use(async (ctx) => {
 
             item["guid"][0].$.isPermaLink = item["guid"][0].$.isPermalink;
             delete item["guid"][0].$.isPermalink;
-            item["itunes:subtitle"][0] =
-                item["itunes:subtitle"][0].slice(0, -3) + "…";
+            item["itunes:subtitle"][0].length < 255
+                ? item["itunes:subtitle"][0]
+                : item["itunes:subtitle"][0].slice(0, 255) + "…";
             item["itunes:summary"][0] = item["itunes:summary"][0].replace(
                 /(<([^>]+)>)/gi,
                 ""