diff --git a/src/Storages/MergeTree/MergeTask.cpp b/src/Storages/MergeTree/MergeTask.cpp
index 20e8ed31cb2..77437da75b4 100644
--- a/src/Storages/MergeTree/MergeTask.cpp
+++ b/src/Storages/MergeTree/MergeTask.cpp
@@ -1428,7 +1428,7 @@ public:
         ///  that is going in insertion order.
         ProcessorPtr merged_transform;
 
-        const auto &header = pipeline.getHeader();
+        const auto & header = pipeline.getHeader();
         const auto input_streams_count = pipeline.getNumStreams();
 
         WriteBuffer * rows_sources_write_buf = nullptr;