diff --git a/deps/leveldb/leveldb-1.20/db/db_impl.cc b/deps/leveldb/leveldb-1.20/db/db_impl.cc
index f43ad76..7d01024 100755
--- a/deps/leveldb/leveldb-1.20/db/db_impl.cc
+++ b/deps/leveldb/leveldb-1.20/db/db_impl.cc
@@ -1108,7 +1108,7 @@ int64_t DBImpl::TEST_MaxNextLevelOverlappingBytes() {
 
 Status DBImpl::Get(const ReadOptions& options,
                    const Slice& key,
-                   std::string* value) {
+                   ValueSink* value) {
   Status s;
   MutexLock l(&mutex_);
   SequenceNumber snapshot;
diff --git a/deps/leveldb/leveldb-1.20/db/db_impl.h b/deps/leveldb/leveldb-1.20/db/db_impl.h
index 8ff323e..7df4701 100644
--- a/deps/leveldb/leveldb-1.20/db/db_impl.h
+++ b/deps/leveldb/leveldb-1.20/db/db_impl.h
@@ -12,6 +12,7 @@
 #include "db/snapshot.h"
 #include "leveldb/db.h"
 #include "leveldb/env.h"
+#include "leveldb/value_sink.h"
 #include "port/port.h"
 #include "port/thread_annotations.h"
 
@@ -34,7 +35,7 @@ class DBImpl : public DB {
   virtual Status Write(const WriteOptions& options, WriteBatch* updates);
   virtual Status Get(const ReadOptions& options,
                      const Slice& key,
-                     std::string* value);
+                     ValueSink* value);
   virtual Iterator* NewIterator(const ReadOptions&);
   virtual const Snapshot* GetSnapshot();
   virtual void ReleaseSnapshot(const Snapshot* snapshot);
diff --git a/deps/leveldb/leveldb-1.20/db/memtable.cc b/deps/leveldb/leveldb-1.20/db/memtable.cc
index bfec0a7..79c63cc 100644
--- a/deps/leveldb/leveldb-1.20/db/memtable.cc
+++ b/deps/leveldb/leveldb-1.20/db/memtable.cc
@@ -105,7 +105,7 @@ void MemTable::Add(SequenceNumber s, ValueType type,
   table_.Insert(buf);
 }
 
-bool MemTable::Get(const LookupKey& key, std::string* value, Status* s) {
+bool MemTable::Get(const LookupKey& key, ValueSink* value, Status* s) {
   Slice memkey = key.memtable_key();
   Table::Iterator iter(&table_);
   iter.Seek(memkey.data());
diff --git a/deps/leveldb/leveldb-1.20/db/memtable.h b/deps/leveldb/leveldb-1.20/db/memtable.h
index 9f41567..c7f89e6 100644
--- a/deps/leveldb/leveldb-1.20/db/memtable.h
+++ b/deps/leveldb/leveldb-1.20/db/memtable.h
@@ -7,6 +7,7 @@
 
 #include <string>
 #include "leveldb/db.h"
+#include "leveldb/value_sink.h"
 #include "db/dbformat.h"
 #include "db/skiplist.h"
 #include "util/arena.h"
@@ -58,7 +59,7 @@ class MemTable {
   // If memtable contains a deletion for key, store a NotFound() error
   // in *status and return true.
   // Else, return false.
-  bool Get(const LookupKey& key, std::string* value, Status* s);
+  bool Get(const LookupKey& key, ValueSink* value, Status* s);
 
  private:
   ~MemTable();  // Private since only Unref() should be used to delete it
diff --git a/deps/leveldb/leveldb-1.20/db/version_set.cc b/deps/leveldb/leveldb-1.20/db/version_set.cc
index b1256f9..056e738 100755
--- a/deps/leveldb/leveldb-1.20/db/version_set.cc
+++ b/deps/leveldb/leveldb-1.20/db/version_set.cc
@@ -262,7 +262,7 @@ struct Saver {
   SaverState state;
   const Comparator* ucmp;
   Slice user_key;
-  std::string* value;
+  ValueSink* value;
 };
 }
 static void SaveValue(void* arg, const Slice& ikey, const Slice& v) {
@@ -331,7 +331,7 @@ void Version::ForEachOverlapping(Slice user_key, Slice internal_key,
 
 Status Version::Get(const ReadOptions& options,
                     const LookupKey& k,
-                    std::string* value,
+                    ValueSink* value,
                     GetStats* stats) {
   Slice ikey = k.internal_key();
   Slice user_key = k.user_key();
diff --git a/deps/leveldb/leveldb-1.20/db/version_set.h b/deps/leveldb/leveldb-1.20/db/version_set.h
index c4e7ac3..718fa71 100755
--- a/deps/leveldb/leveldb-1.20/db/version_set.h
+++ b/deps/leveldb/leveldb-1.20/db/version_set.h
@@ -22,6 +22,7 @@
 #include "db/version_edit.h"
 #include "port/port.h"
 #include "port/thread_annotations.h"
+#include "leveldb/value_sink.h"
 
 namespace leveldb {
 
@@ -70,7 +71,7 @@ class Version {
     FileMetaData* seek_file;
     int seek_file_level;
   };
-  Status Get(const ReadOptions&, const LookupKey& key, std::string* val,
+  Status Get(const ReadOptions&, const LookupKey& key, ValueSink* val,
              GetStats* stats);
 
   // Adds "stats" into the current state.  Returns true if a new
diff --git a/deps/leveldb/leveldb-1.20/include/leveldb/db.h b/deps/leveldb/leveldb-1.20/include/leveldb/db.h
index bfab10a..f0b5060 100755
--- a/deps/leveldb/leveldb-1.20/include/leveldb/db.h
+++ b/deps/leveldb/leveldb-1.20/include/leveldb/db.h
@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include "leveldb/iterator.h"
 #include "leveldb/options.h"
+#include "leveldb/value_sink.h"
 
 namespace leveldb {
 
@@ -81,7 +82,7 @@ class DB {
   //
   // May return some other Status on an error.
   virtual Status Get(const ReadOptions& options,
-                     const Slice& key, std::string* value) = 0;
+                     const Slice& key, ValueSink* value) = 0;
 
   // Return a heap-allocated iterator over the contents of the database.
   // The result of NewIterator() is initially invalid (caller must
diff --git a/deps/leveldb/leveldb-1.20/include/leveldb/value_sink.h b/deps/leveldb/leveldb-1.20/include/leveldb/value_sink.h
new file mode 100644
index 0000000..87f80d9
--- /dev/null
+++ b/deps/leveldb/leveldb-1.20/include/leveldb/value_sink.h
@@ -0,0 +1,26 @@
+#ifndef STORAGE_LEVELDB_INCLUDE_VALUE_SINK_H_
+#define STORAGE_LEVELDB_INCLUDE_VALUE_SINK_H_
+
+namespace leveldb {
+  struct ValueSink {
+    public:
+      ValueSink () {}
+
+      // Same as std::string:assign
+      virtual void assign(const char* s, size_t n) = 0;
+  };
+
+  struct StringValueSink : public ValueSink {
+    public:
+      StringValueSink (std::string* nut)
+        : ValueSink(), nut_(nut) {}
+
+      void assign(const char* s, size_t n) override {
+        nut_->assign(s, n);
+      }
+    private:
+      std::string* nut_;
+  };
+}
+
+#endif // STORAGE_LEVELDB_INCLUDE_VALUE_SINK_H_