diff --git a/src/Aggregation/Pipeline/AbstractPipelineAggregation.php b/src/Aggregation/Pipeline/AbstractPipelineAggregation.php
index 5fe680dfea33596025c7d2698ae25126ce2005d0..dac89fc4e15ed2dbb6b4a0073cfb27db9c8dbbe0 100644
--- a/src/Aggregation/Pipeline/AbstractPipelineAggregation.php
+++ b/src/Aggregation/Pipeline/AbstractPipelineAggregation.php
@@ -18,7 +18,7 @@ abstract class AbstractPipelineAggregation extends AbstractAggregation
      * @param string $name
      * @param $bucketsPath
      */
-    public function __construct($name, $bucketsPath)
+    public function __construct($name, $bucketsPath = null)
     {
         parent::__construct($name);
         $this->setBucketsPath($bucketsPath);