diff --git a/src/common.hpp b/src/common.hpp
index bed6c3c..647e306 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -30,6 +30,7 @@
 #include <boost/lexical_cast.hpp>
 #include <boost/asio.hpp>
 #include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/utility.hpp>
 
 #include <boost/iostreams/detail/ios.hpp>
 #include <boost/iostreams/categories.hpp>
@@ -49,8 +50,6 @@
 namespace ptr_lib = std;
 namespace func_lib = std;
 
-using std::noncopyable;
-
 using std::shared_ptr;
 using std::make_shared;
 using std::enable_shared_from_this;
@@ -76,8 +75,6 @@
 namespace ptr_lib = boost;
 namespace func_lib = boost;
 
-using boost::noncopyable;
-
 using boost::shared_ptr;
 using boost::make_shared;
 using boost::enable_shared_from_this;
@@ -91,6 +88,7 @@
 
 namespace ndn {
 
+using boost::noncopyable;
 
 /**
  * A time interval represented as the number of milliseconds.
diff --git a/src/encoding/block.cpp b/src/encoding/block.cpp
index 9c8ba1e..5409879 100644
--- a/src/encoding/block.cpp
+++ b/src/encoding/block.cpp
@@ -39,8 +39,8 @@
   , m_end(m_buffer->end())
   , m_size(m_end - m_begin)
 {
-  m_value_begin = m_buffer->begin();
-  m_value_end   = m_buffer->end();
+  m_value_begin = m_begin;
+  m_value_end   = m_end;
   
   m_type = Tlv::readType(m_value_begin, m_value_end);
 
@@ -58,8 +58,8 @@
   , m_end(end)
   , m_size(m_end - m_begin)
 {
-  m_value_begin = m_buffer->begin();
-  m_value_end   = m_buffer->end();
+  m_value_begin = m_begin;
+  m_value_end   = m_end;
 
   m_type = Tlv::readType(m_value_begin, m_value_end);
   uint64_t length = Tlv::readVarNumber(m_value_begin, m_value_end);
diff --git a/src/encoding/block.hpp b/src/encoding/block.hpp
index 2afd154..a2f19be 100644
--- a/src/encoding/block.hpp
+++ b/src/encoding/block.hpp
@@ -17,6 +17,9 @@
 
 namespace ndn {
 
+template<bool> class EncodingImpl;
+typedef EncodingImpl<true> EncodingBuffer;
+
 /**
  * @brief Class representing wire element of the NDN packet
  */
@@ -223,6 +226,7 @@
   Buffer::const_iterator m_value_end;
 
   mutable element_container m_subBlocks;
+  friend class EncodingImpl<true>;
 };
 
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/src/encoding/encoding-buffer.hpp b/src/encoding/encoding-buffer.hpp
index 62d6a12..b4c9018 100644
--- a/src/encoding/encoding-buffer.hpp
+++ b/src/encoding/encoding-buffer.hpp
@@ -18,6 +18,7 @@
 
 #include "buffer.hpp"
 #include "tlv.hpp"
+#include "block.hpp"
 
 #include <boost/lexical_cast.hpp>