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diff --git a/src/rocksdb/util/kv_map.h b/src/rocksdb/util/kv_map.h
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+// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
+// This source code is licensed under both the GPLv2 (found in the
+// COPYING file in the root directory) and Apache 2.0 License
+// (found in the LICENSE.Apache file in the root directory).
+#pragma once
+
+#include <map>
+#include <string>
+
+#include "rocksdb/comparator.h"
+#include "rocksdb/slice.h"
+#include "util/coding.h"
+
+namespace ROCKSDB_NAMESPACE {
+namespace stl_wrappers {
+
+struct LessOfComparator {
+ explicit LessOfComparator(const Comparator* c = BytewiseComparator())
+ : cmp(c) {}
+
+ bool operator()(const std::string& a, const std::string& b) const {
+ return cmp->Compare(Slice(a), Slice(b)) < 0;
+ }
+ bool operator()(const Slice& a, const Slice& b) const {
+ return cmp->Compare(a, b) < 0;
+ }
+
+ const Comparator* cmp;
+};
+
+typedef std::map<std::string, std::string, LessOfComparator> KVMap;
+}
+} // namespace ROCKSDB_NAMESPACE