diff --git a/dbms/src/DataStreams/SummingSortedBlockInputStream.cpp b/dbms/src/DataStreams/SummingSortedBlockInputStream.cpp
index f4a8cb052f3..ca9305f7506 100644
--- a/dbms/src/DataStreams/SummingSortedBlockInputStream.cpp
+++ b/dbms/src/DataStreams/SummingSortedBlockInputStream.cpp
@@ -248,7 +248,7 @@ void SummingSortedBlockInputStream::merge(ColumnPlainPtrs & merged_columns, std:
     finished = true;
 }
 
-template <class TSortCursor>
+template <typename TSortCursor>
 bool SummingSortedBlockInputStream::mergeMaps(Row & row, TSortCursor & cursor)
 {
     bool non_empty_map_present = false;