diff --git a/libdevcore/Log.cpp b/libdevcore/Log.cpp
index 983431b88..e086278ec 100644
--- a/libdevcore/Log.cpp
+++ b/libdevcore/Log.cpp
@@ -24,6 +24,7 @@
 #include <string>
 #include <iostream>
 #include <thread>
+#include <boost/asio/ip/tcp.hpp>
 #include "Guards.h"
 using namespace std;
 using namespace dev;
@@ -69,6 +70,11 @@ LogOutputStreamBase::LogOutputStreamBase(char const* _id, std::type_info const*
 	}
 }
 
+void LogOutputStreamBase::append(boost::asio::ip::basic_endpoint<boost::asio::ip::tcp> const& _t)
+{
+	m_sstr << EthNavyUnder "tcp://" << _t << EthReset;
+}
+
 /// Associate a name with each thread for nice logging.
 struct ThreadLocalLogName
 {
diff --git a/libdevcore/Log.h b/libdevcore/Log.h
index 71c2b3450..d132b3a24 100644
--- a/libdevcore/Log.h
+++ b/libdevcore/Log.h
@@ -26,7 +26,6 @@
 #include <ctime>
 #include <chrono>
 #include <boost/thread.hpp>
-#include <boost/asio.hpp>
 #include "vector_ref.h"
 #include "Common.h"
 #include "CommonIO.h"
@@ -34,6 +33,8 @@
 #include "FixedHash.h"
 #include "Terminal.h"
 
+namespace boost { namespace asio { namespace ip { template<class T>class basic_endpoint; class tcp; } } }
+
 namespace dev
 {
 
@@ -125,6 +126,7 @@ public:
 	void append(std::string const& _t) { m_sstr << EthGreen "\"" + _t + "\"" EthReset; }
 	void append(bytes const& _t) { m_sstr << EthYellow "%" << toHex(_t) << EthReset; }
 	void append(bytesConstRef _t) { m_sstr << EthYellow "%" << toHex(_t) << EthReset; }
+	void append(boost::asio::ip::basic_endpoint<boost::asio::ip::tcp> const& _t);
 	template <class T> void append(std::vector<T> const& _t)
 	{
 		m_sstr << EthWhite "[" EthReset;
@@ -172,10 +174,6 @@ public:
 	{
 		m_sstr << toString(_t);
 	}
-	template <class T> void append(boost::asio::ip::tcp::endpoint const& _t)
-	{
-		m_sstr << EthNavyUnder "tcp://" << _t << EthReset;
-	}
 
 protected:
 	bool m_autospacing = false;