diff --git a/dbms/src/Interpreters/Join.cpp b/dbms/src/Interpreters/Join.cpp
index f519361191f..7b2d6eaeb26 100644
--- a/dbms/src/Interpreters/Join.cpp
+++ b/dbms/src/Interpreters/Join.cpp
@@ -1417,7 +1417,7 @@ BlockInputStreamPtr Join::createStreamWithNonJoinedRows(const Block & result_sam
 }
 
 
-bool Join::hasStreamWithNonJoinedRows()
+bool Join::hasStreamWithNonJoinedRows() const
 {
      if (table_join->strictness() == ASTTableJoin::Strictness::Asof ||
         table_join->strictness() == ASTTableJoin::Strictness::Semi)
diff --git a/dbms/src/Interpreters/Join.h b/dbms/src/Interpreters/Join.h
index 36c57d4494c..23b6d51ec0b 100644
--- a/dbms/src/Interpreters/Join.h
+++ b/dbms/src/Interpreters/Join.h
@@ -179,7 +179,7 @@ public:
       * left_sample_block is passed without account of 'use_nulls' setting (columns will be converted to Nullable inside).
       */
     BlockInputStreamPtr createStreamWithNonJoinedRows(const Block & result_sample_block, UInt64 max_block_size) const override;
-    bool hasStreamWithNonJoinedRows();
+    bool hasStreamWithNonJoinedRows() const override;
 
     /// Number of keys in all built JOIN maps.
     size_t getTotalRowCount() const final;