diff --git a/src/node_data.cpp b/src/node_data.cpp
index a1ca900..46e1463 100644
--- a/src/node_data.cpp
+++ b/src/node_data.cpp
@@ -1,5 +1,5 @@
 #include <assert.h>
-#include <boost/smart_ptr/shared_ptr.hpp>
+#include <iterator>
 #include <sstream>
 
 #include "yaml-cpp/exceptions.h"
@@ -104,7 +104,7 @@ void node_data::compute_seq_size() const {
 void node_data::compute_map_size() const {
   kv_pairs::iterator it = m_undefinedPairs.begin();
   while (it != m_undefinedPairs.end()) {
-    kv_pairs::iterator jt = boost::next(it);
+    kv_pairs::iterator jt = std::next(it);
     if (it->first->is_defined() && it->second->is_defined())
       m_undefinedPairs.erase(it);
     it = jt;