diff --git a/src/Processors/Transforms/MergeSortingTransform.h b/src/Processors/Transforms/MergeSortingTransform.h
index a8786e5a034..043cb3f36c1 100644
--- a/src/Processors/Transforms/MergeSortingTransform.h
+++ b/src/Processors/Transforms/MergeSortingTransform.h
@@ -38,6 +38,9 @@ private:
     VolumePtr tmp_volume;
     size_t min_free_disk_space;
 
+    size_t sum_rows_in_blocks = 0;
+    size_t sum_bytes_in_blocks = 0;
+
     Logger * log = &Logger::get("MergeSortingTransform");
 
     /// If remerge doesn't save memory at least several times, mark it as useless and don't do it anymore.
diff --git a/src/Processors/Transforms/SortingTransform.h b/src/Processors/Transforms/SortingTransform.h
index 49bdf303c7f..9178991f324 100644
--- a/src/Processors/Transforms/SortingTransform.h
+++ b/src/Processors/Transforms/SortingTransform.h
@@ -66,8 +66,8 @@ class SortingTransform : public IProcessor
 public:
     /// limit - if not 0, allowed to return just first 'limit' rows in sorted order.
     SortingTransform(const Block & header,
-                          const SortDescription & description_,
-                          size_t max_merged_block_size_, UInt64 limit_);
+        const SortDescription & description_,
+        size_t max_merged_block_size_, UInt64 limit_);
 
     ~SortingTransform() override;
 
@@ -83,9 +83,6 @@ protected:
     size_t max_merged_block_size;
     UInt64 limit;
 
-    size_t sum_rows_in_blocks = 0;
-    size_t sum_bytes_in_blocks = 0;
-
     /// Before operation, will remove constant columns from blocks. And after, place constant columns back.
     /// (to avoid excessive virtual function calls and because constants cannot be serialized in Native format for temporary files)
     /// Save original block structure here.