diff --git a/src/Storages/MergeTree/MergeTask.cpp b/src/Storages/MergeTree/MergeTask.cpp
index 3bee2ecb0d9..fb5bbc4729c 100644
--- a/src/Storages/MergeTree/MergeTask.cpp
+++ b/src/Storages/MergeTree/MergeTask.cpp
@@ -1224,7 +1224,8 @@ public:
         UInt64 merge_block_size_rows_,
         UInt64 merge_block_size_bytes_,
         bool blocks_are_granules_size_,
-        bool cleanup_)
+        bool cleanup_,
+        time_t time_of_merge_)
         : ITransformingStep(input_stream_, input_stream_.header, Traits{}) // TODO proper traits?
         , sort_description(sort_description_)
         , partition_key_columns(partition_key_columns_)
@@ -1234,6 +1235,7 @@ public:
         , merge_block_size_bytes(merge_block_size_bytes_)
         , blocks_are_granules_size(blocks_are_granules_size_)
         , cleanup(cleanup_)
+        , time_of_merge(time_of_merge_)
     {}
 
     String getName() const override { return "ApplyMergePolicy"; }
@@ -1245,10 +1247,6 @@ public:
         ///  that is going in insertion order.
         ProcessorPtr merged_transform;
 
-//        /// There is no sense to have the block size bigger than one granule for merge operations.
-//        const UInt64 merge_block_size_rows = data_settings->merge_max_block_size;
-//        const UInt64 merge_block_size_bytes = data_settings->merge_max_block_size_bytes;
-
         const auto &header = pipeline.getHeader();
         const auto input_streams_count = pipeline.getNumStreams();
 
@@ -1330,15 +1328,15 @@ public:
     }
 
 private:
-    SortDescription sort_description;
-    Names partition_key_columns;
-    MergeTreeData::MergingParams merging_params{};
+    const SortDescription sort_description;
+    const Names partition_key_columns;
+    const MergeTreeData::MergingParams merging_params{};
     WriteBuffer * rows_sources_write_buf;
     const UInt64 merge_block_size_rows;
     const UInt64 merge_block_size_bytes;
-    bool blocks_are_granules_size;
-    bool cleanup{false};
-    time_t time_of_merge{0};
+    const bool blocks_are_granules_size;
+    const bool cleanup{false};
+    const time_t time_of_merge{0};
 };
 
 
@@ -1403,7 +1401,7 @@ private:
 };
 
 
-void MergeTask::ExecuteAndFinalizeHorizontalPart::createMergedStream()
+void MergeTask::ExecuteAndFinalizeHorizontalPart::createMergedStream() const
 {
     /** Read from all parts, merge and write into a new one.
       * In passing, we calculate expression for sorting.
@@ -1516,7 +1514,8 @@ void MergeTask::ExecuteAndFinalizeHorizontalPart::createMergedStream()
             data_settings->merge_max_block_size,
             data_settings->merge_max_block_size_bytes,
             ctx->blocks_are_granules_size,
-            global_ctx->cleanup);
+            global_ctx->cleanup,
+            global_ctx->time_of_merge);
         merge_step->setStepDescription("Merge sorted parts");
         merge_parts_query_plan.addStep(std::move(merge_step));
     }
diff --git a/src/Storages/MergeTree/MergeTask.h b/src/Storages/MergeTree/MergeTask.h
index c80995888d4..a5d7851932c 100644
--- a/src/Storages/MergeTree/MergeTask.h
+++ b/src/Storages/MergeTree/MergeTask.h
@@ -291,7 +291,7 @@ private:
         bool executeMergeProjections();
 
         MergeAlgorithm chooseMergeAlgorithm() const;
-        void createMergedStream();
+        void createMergedStream() const;
         void extractMergingAndGatheringColumns() const;
 
         void setRuntimeContext(StageRuntimeContextPtr local, StageRuntimeContextPtr global) override