diff --git a/include/yaml-cpp/value/detail/iterator.h b/include/yaml-cpp/value/detail/iterator.h
index 2a4bb86..eafab01 100644
--- a/include/yaml-cpp/value/detail/iterator.h
+++ b/include/yaml-cpp/value/detail/iterator.h
@@ -8,25 +8,13 @@
 
 #include "yaml-cpp/dll.h"
 #include "yaml-cpp/value/ptr.h"
-#include "yaml-cpp/value/value.h"
 #include <boost/iterator/iterator_facade.hpp>
 #include <boost/utility/enable_if.hpp>
-#include <list>
-#include <utility>
-#include <vector>
 
 namespace YAML
 {
 	namespace detail
 	{
-		class node;
-		
-		struct iterator_value: public Value, std::pair<Value, Value> {
-			iterator_value() {}
-			explicit iterator_value(const Value& rhs): Value(rhs) {}
-			explicit iterator_value(const Value& key, const Value& value): std::pair<Value, Value>(key, value) {}
-		};
-
 		struct iterator_type { enum value { None, Sequence, Map }; };
 
 		template<typename V, typename SeqIter, typename MapIter>
@@ -94,16 +82,6 @@ namespace YAML
 			SeqIter m_seqIt;
 			MapIter m_mapIt;
 		};
-
-		typedef std::vector<node *> node_seq;
-		typedef std::pair<node *, node *> kv_pair;
-		typedef std::list<kv_pair> node_map;
-		
-		typedef node_seq::iterator node_seq_iterator;
-		typedef node_seq::const_iterator node_seq_const_iterator;
-
-		typedef node_map::iterator node_map_iterator;
-		typedef node_map::const_iterator node_map_const_iterator;
 	}
 }
 
diff --git a/include/yaml-cpp/value/detail/iterator_fwd.h b/include/yaml-cpp/value/detail/iterator_fwd.h
new file mode 100644
index 0000000..023e5af
--- /dev/null
+++ b/include/yaml-cpp/value/detail/iterator_fwd.h
@@ -0,0 +1,38 @@
+#ifndef VALUE_DETAIL_ITERATOR_FWD_H_62B23520_7C8E_11DE_8A39_0800200C9A66
+#define VALUE_DETAIL_ITERATOR_FWD_H_62B23520_7C8E_11DE_8A39_0800200C9A66
+
+#if defined(_MSC_VER) || (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || (__GNUC__ >= 4)) // GCC supports "pragma once" correctly since 3.4
+#pragma once
+#endif
+
+
+#include "yaml-cpp/dll.h"
+#include <list>
+#include <utility>
+#include <vector>
+
+namespace YAML
+{
+	class node;
+
+	namespace detail {
+		struct iterator_value;
+		typedef std::vector<node *> node_seq;
+		typedef std::pair<node *, node *> kv_pair;
+		typedef std::list<kv_pair> node_map;
+		
+		typedef node_seq::iterator node_seq_iterator;
+		typedef node_seq::const_iterator node_seq_const_iterator;
+		
+		typedef node_map::iterator node_map_iterator;
+		typedef node_map::const_iterator node_map_const_iterator;
+		
+		template<typename V, typename SeqIter, typename MapIter> class iterator_base;
+	}
+	
+	typedef detail::iterator_base<detail::iterator_value, detail::node_seq_iterator, detail::node_map_iterator> iterator;
+	
+	typedef detail::iterator_base<const detail::iterator_value, detail::node_seq_const_iterator, detail::node_map_const_iterator> const_iterator;
+}
+
+#endif // VALUE_DETAIL_ITERATOR_FWD_H_62B23520_7C8E_11DE_8A39_0800200C9A66
diff --git a/include/yaml-cpp/value/iterator.h b/include/yaml-cpp/value/iterator.h
index d687368..6055294 100644
--- a/include/yaml-cpp/value/iterator.h
+++ b/include/yaml-cpp/value/iterator.h
@@ -7,32 +7,22 @@
 
 
 #include "yaml-cpp/dll.h"
+#include "yaml-cpp/value/value.h"
+#include "yaml-cpp/value/detail/iterator_fwd.h"
 #include "yaml-cpp/value/detail/iterator.h"
+#include <list>
+#include <utility>
+#include <vector>
 
 namespace YAML
 {
-	class iterator: public detail::iterator_base<detail::iterator_value, detail::node_seq_iterator, detail::node_map_iterator>
-	{
-	private:
-		typedef detail::iterator_base<detail::iterator_value, detail::node_seq_iterator, detail::node_map_iterator> base;
-		
-	public:
-		iterator() {}
-		explicit iterator(detail::shared_memory_holder pMemory, detail::node_seq_iterator seqIt): base(pMemory, seqIt) {}
-		explicit iterator(detail::shared_memory_holder pMemory, detail::node_map_iterator mapIt): base(pMemory, mapIt) {}
-	};
-	
-	class const_iterator: public detail::iterator_base<const detail::iterator_value, detail::node_seq_const_iterator, detail::node_map_const_iterator>
-	{
-	private:
-		typedef detail::iterator_base<const detail::iterator_value, detail::node_seq_const_iterator, detail::node_map_const_iterator> base;
-
-	public:
-		const_iterator() {}
-		explicit const_iterator(detail::shared_memory_holder pMemory, detail::node_seq_const_iterator seqIt): base(pMemory, seqIt) {}
-		explicit const_iterator(detail::shared_memory_holder pMemory, detail::node_map_const_iterator mapIt): base(pMemory, mapIt) {}
-		explicit const_iterator(const iterator& rhs): base(rhs) {}
-	};
+	namespace detail {
+		struct iterator_value: public Value, std::pair<Value, Value> {
+			iterator_value() {}
+			explicit iterator_value(const Value& rhs): Value(rhs) {}
+			explicit iterator_value(const Value& key, const Value& value): std::pair<Value, Value>(key, value) {}
+		};
+	}
 }
 
 #endif // VALUE_ITERATOR_H_62B23520_7C8E_11DE_8A39_0800200C9A66
diff --git a/include/yaml-cpp/value/value.h b/include/yaml-cpp/value/value.h
index 51f6b19..bb4f404 100644
--- a/include/yaml-cpp/value/value.h
+++ b/include/yaml-cpp/value/value.h
@@ -9,13 +9,11 @@
 #include "yaml-cpp/dll.h"
 #include "yaml-cpp/value/ptr.h"
 #include "yaml-cpp/value/type.h"
+#include "yaml-cpp/value/detail/iterator_fwd.h"
 #include <stdexcept>
 
 namespace YAML
 {
-	class iterator;
-	class const_iterator;
-	
 	class Value
 	{
 	public: