diff --git a/src/sql/engine/dml/ob_table_replace.cpp b/src/sql/engine/dml/ob_table_replace.cpp
index 8d65b830669ffe286272cdf8af8ab68ede25850b..37753e16a667286935004234c6ca79d0cbf898e3 100644
--- a/src/sql/engine/dml/ob_table_replace.cpp
+++ b/src/sql/engine/dml/ob_table_replace.cpp
@@ -217,7 +217,7 @@ int ObTableReplace::inner_close(ObExecContext& ctx) const
   return ObTableModify::inner_close(ctx);
 }
 
-int64_t ObTableReplace::to_string_kv(char* buf, int64_t buf_len) const
+int64_t ObTableReplace::to_string_kv(char* buf, const int64_t buf_len) const
 {
   int64_t pos = 0;
   J_KV(N_TID, table_id_, N_CID, column_ids_, N_PRIMARY_CID, primary_key_ids_, N_HAS_INDEX, only_one_unique_key_);
diff --git a/src/sql/engine/dml/ob_table_replace.h b/src/sql/engine/dml/ob_table_replace.h
index f0b84f36ff42236cf8ed3bdbcf643f461590b794..2228317b1eb4f7664e95f2b0d0a2c74ed46b8c9c 100644
--- a/src/sql/engine/dml/ob_table_replace.h
+++ b/src/sql/engine/dml/ob_table_replace.h
@@ -102,7 +102,7 @@ public:
    * Every op should implement this method.
    */
   virtual int inner_close(ObExecContext& ctx) const;
-  virtual int64_t to_string_kv(char* buf, int64_t buf_len) const;
+  virtual int64_t to_string_kv(char* buf, const int64_t buf_len) const;
   virtual int add_filter(ObSqlExpression* expr);
   virtual int get_next_row(ObExecContext& ctx, const common::ObNewRow*& row) const;
   virtual int init_op_ctx(ObExecContext& ctx) const;