diff --git a/Enyim.Caching/Memcached/Transcoders/DataContractTranscoder.cs b/Enyim.Caching/Memcached/Transcoders/DataContractTranscoder.cs
index ec329a5c..a665c842 100644
--- a/Enyim.Caching/Memcached/Transcoders/DataContractTranscoder.cs
+++ b/Enyim.Caching/Memcached/Transcoders/DataContractTranscoder.cs
@@ -16,7 +16,7 @@ protected override object DeserializeObject(ArraySegment<byte> value)
         {
             using (var ms = new MemoryStream(value.Array, value.Offset, value.Count))
             {
-                using (BsonReader reader = new BsonReader(ms))
+                using (var reader = new BsonDataReader(ms))
                 {
                     JsonSerializer serializer = new JsonSerializer();
                     return serializer.Deserialize(reader);
@@ -28,7 +28,7 @@ protected override ArraySegment<byte> SerializeObject(object value)
         {
             using (var ms = new MemoryStream())
             {
-                using (BsonWriter writer = new BsonWriter(ms))
+                using (var writer = new BsonDataWriter(ms))
                 {
                     JsonSerializer serializer = new JsonSerializer();
                     serializer.Serialize(writer, value);
diff --git a/Enyim.Caching/Memcached/Transcoders/DefaultTranscoder.cs b/Enyim.Caching/Memcached/Transcoders/DefaultTranscoder.cs
index c73a35af..7a9ae927 100755
--- a/Enyim.Caching/Memcached/Transcoders/DefaultTranscoder.cs
+++ b/Enyim.Caching/Memcached/Transcoders/DefaultTranscoder.cs
@@ -356,7 +356,7 @@ protected virtual object DeserializeObject(ArraySegment<byte> value)
         {
             using (var ms = new MemoryStream(value.Array, value.Offset, value.Count))
             {
-                using (BsonReader reader = new BsonReader(ms))
+                using (var reader = new BsonDataReader(ms))
                 {
                     JsonSerializer serializer = new JsonSerializer();
                     return serializer.Deserialize(reader);