diff --git a/src/Interpreters/Aggregator.h b/src/Interpreters/Aggregator.h
index f4aa78043ca4..dd0dada67434 100644
--- a/src/Interpreters/Aggregator.h
+++ b/src/Interpreters/Aggregator.h
@@ -1264,6 +1264,7 @@ class Aggregator final
     friend class ConvertingAggregatedToChunksSource;
     friend class ConvertingAggregatedToChunksWithMergingSource;
     friend class AggregatingInOrderTransform;
+    friend class GlutenAggregatorUtil;
 
     /// Data structure of source blocks.
     Block header;