diff --git a/dbms/src/Storages/MergeTree/MergeTreeReaderStream.h b/dbms/src/Storages/MergeTree/MergeTreeReaderStream.h
index 818c385de91..d7961e38d3d 100644
--- a/dbms/src/Storages/MergeTree/MergeTreeReaderStream.h
+++ b/dbms/src/Storages/MergeTree/MergeTreeReaderStream.h
@@ -31,9 +31,6 @@ public:
     ReadBuffer * data_buffer;
 
 private:
-    /// NOTE: lazily loads marks from the marks cache.
-    const MarkInCompressedFile & getMark(size_t index);
-
     void initMarksLoader();
 
     std::string path_prefix;
@@ -43,7 +40,6 @@ private:
 
     MarkCache * mark_cache;
     bool save_marks_in_cache;
-    MarkCache::MappedPtr marks;
 
     const MergeTreeIndexGranularityInfo * index_granularity_info;