diff --git a/server/src/main/java/org/elasticsearch/search/aggregations/pipeline/SiblingPipelineAggregator.java b/server/src/main/java/org/elasticsearch/search/aggregations/pipeline/SiblingPipelineAggregator.java
index c04bd9fa0dfa4..a131dde9c7673 100644
--- a/server/src/main/java/org/elasticsearch/search/aggregations/pipeline/SiblingPipelineAggregator.java
+++ b/server/src/main/java/org/elasticsearch/search/aggregations/pipeline/SiblingPipelineAggregator.java
@@ -36,7 +36,7 @@
 import java.util.stream.StreamSupport;
 
 public abstract class SiblingPipelineAggregator extends PipelineAggregator {
-    SiblingPipelineAggregator(String name, String[] bucketsPaths, Map<String, Object> metaData) {
+    protected SiblingPipelineAggregator(String name, String[] bucketsPaths, Map<String, Object> metaData) {
         super(name, bucketsPaths, metaData);
     }