diff --git a/lib/main.js b/lib/main.js
index 383b9dfd..c17baf2e 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -693,7 +693,7 @@ they may not work as expected in the Lambda environment.
   }
 
   _getStartingPosition (eventSource) {
-    if (eventSource.EventSourceArn.indexOf('arn:aws:sqs:') === 0) {
+    if (eventSource.EventSourceArn.startsWith('arn:aws:sqs:')) {
       return null
     }
     return eventSource.StartingPosition ? eventSource.StartingPosition : 'LATEST'