build: use C++11

Change-Id: I0e58ac4e9cb42d07a9b58125d761875f91c7744c
Refs: #1930
diff --git a/src/handles/tcp-bulk-insert-handle.hpp b/src/handles/tcp-bulk-insert-handle.hpp
index ef1cbdd..62ced11 100644
--- a/src/handles/tcp-bulk-insert-handle.hpp
+++ b/src/handles/tcp-bulk-insert-handle.hpp
@@ -59,7 +59,7 @@
 private:
   void
   handleAccept(const boost::system::error_code& error,
-               const shared_ptr<boost::asio::ip::tcp::socket>& socket);
+               const std::shared_ptr<boost::asio::ip::tcp::socket>& socket);
 
 private:
   boost::asio::ip::tcp::acceptor m_acceptor;