diff --git a/index.ts b/index.ts
index 6abfce1..9e8ace8 100644
--- a/index.ts
+++ b/index.ts
@@ -25,8 +25,8 @@ async function start() {
       const data = JSON.parse(msg.content.toString());
 
       eventName = data.Records?.[0]?.eventName;
-      key = decodeURIComponent(data.Records?.[0]?.s3?.object?.key || "");
       bucket = data.Records?.[0]?.s3?.bucket?.name;
+      key = (data.Key as string).replace(bucket ?? "", "");
 
       if (!eventName || !bucket || !key) {
         throw new Error("Missing required event fields.");