diff --git a/chapter-3/Listing 3.1 - 3.4 - Transcode Video Lambda/index.js b/chapter-3/Listing 3.1 - 3.4 - Transcode Video Lambda/index.js
index 2f7b59a..ff01284 100644
--- a/chapter-3/Listing 3.1 - 3.4 - Transcode Video Lambda/index.js	
+++ b/chapter-3/Listing 3.1 - 3.4 - Transcode Video Lambda/index.js	
@@ -25,6 +25,7 @@ exports.handler = function(event, context, callback){
 
     var params = {
         PipelineId: '1451470066051-jscnci',
+        OutputKeyPrefix: outputKey + '/',        
         Input: {
             Key: sourceKey
         },