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diff --git a/src/leveldb/helpers/memenv/memenv.h b/src/leveldb/helpers/memenv/memenv.h
new file mode 100644
index 000000000..03b88de76
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+++ b/src/leveldb/helpers/memenv/memenv.h
@@ -0,0 +1,20 @@
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#ifndef STORAGE_LEVELDB_HELPERS_MEMENV_MEMENV_H_
+#define STORAGE_LEVELDB_HELPERS_MEMENV_MEMENV_H_
+
+namespace leveldb {
+
+class Env;
+
+// Returns a new environment that stores its data in memory and delegates
+// all non-file-storage tasks to base_env. The caller must delete the result
+// when it is no longer needed.
+// *base_env must remain live while the result is in use.
+Env* NewMemEnv(Env* base_env);
+
+}  // namespace leveldb
+
+#endif  // STORAGE_LEVELDB_HELPERS_MEMENV_MEMENV_H_