diff --git a/src/DynamoDbQueryBuilder.php b/src/DynamoDbQueryBuilder.php
index d0b1ee0..ceef481 100644
--- a/src/DynamoDbQueryBuilder.php
+++ b/src/DynamoDbQueryBuilder.php
@@ -429,7 +429,7 @@ public function chunk($chunkSize, callable $callback)
         while (true) {
             $results = $this->getAll([], $chunkSize, false);
 
-            if ($results->isNotEmpty()) {
+            if (!$results->isEmpty()) {
                 if (call_user_func($callback, $results) === false) {
                     return false;
                 }