diff --git a/src/Interpreters/Aggregator.h b/src/Interpreters/Aggregator.h
index 6691f6d2645e..a7c983e897ce 100644
--- a/src/Interpreters/Aggregator.h
+++ b/src/Interpreters/Aggregator.h
@@ -291,6 +291,7 @@ class Aggregator final
     friend class ConvertingAggregatedToChunksSource;
     friend class ConvertingAggregatedToChunksWithMergingSource;
     friend class AggregatingInOrderTransform;
+    friend class GlutenAggregatorUtil;
 
     /// Data structure of source blocks.
     Block header;