diff --git a/src/pugixml.cpp b/src/pugixml.cpp
index efdcdf6..0d36e3b 100644
--- a/src/pugixml.cpp
+++ b/src/pugixml.cpp
@@ -6735,7 +6735,7 @@ namespace pugi
 		return const_cast<xml_node*>(&_wrap); // BCC5 workaround
 	}
 
-	PUGI__FN const xml_node_iterator& xml_node_iterator::operator++()
+	PUGI__FN xml_node_iterator& xml_node_iterator::operator++()
 	{
 		assert(_wrap._root);
 		_wrap._root = _wrap._root->next_sibling;
@@ -6749,7 +6749,7 @@ namespace pugi
 		return temp;
 	}
 
-	PUGI__FN const xml_node_iterator& xml_node_iterator::operator--()
+	PUGI__FN xml_node_iterator& xml_node_iterator::operator--()
 	{
 		_wrap = _wrap._root ? _wrap.previous_sibling() : _parent.last_child();
 		return *this;
@@ -6796,7 +6796,7 @@ namespace pugi
 		return const_cast<xml_attribute*>(&_wrap); // BCC5 workaround
 	}
 
-	PUGI__FN const xml_attribute_iterator& xml_attribute_iterator::operator++()
+	PUGI__FN xml_attribute_iterator& xml_attribute_iterator::operator++()
 	{
 		assert(_wrap._attr);
 		_wrap._attr = _wrap._attr->next_attribute;
@@ -6810,7 +6810,7 @@ namespace pugi
 		return temp;
 	}
 
-	PUGI__FN const xml_attribute_iterator& xml_attribute_iterator::operator--()
+	PUGI__FN xml_attribute_iterator& xml_attribute_iterator::operator--()
 	{
 		_wrap = _wrap._attr ? _wrap.previous_attribute() : _parent.last_attribute();
 		return *this;
@@ -6857,7 +6857,7 @@ namespace pugi
 		return const_cast<xml_node*>(&_wrap); // BCC5 workaround
 	}
 
-	PUGI__FN const xml_named_node_iterator& xml_named_node_iterator::operator++()
+	PUGI__FN xml_named_node_iterator& xml_named_node_iterator::operator++()
 	{
 		assert(_wrap._root);
 		_wrap = _wrap.next_sibling(_name);
@@ -6871,7 +6871,7 @@ namespace pugi
 		return temp;
 	}
 
-	PUGI__FN const xml_named_node_iterator& xml_named_node_iterator::operator--()
+	PUGI__FN xml_named_node_iterator& xml_named_node_iterator::operator--()
 	{
 		if (_wrap._root)
 			_wrap = _wrap.previous_sibling(_name);
diff --git a/src/pugixml.hpp b/src/pugixml.hpp
index 7e2ce77..023df44 100644
--- a/src/pugixml.hpp
+++ b/src/pugixml.hpp
@@ -851,10 +851,10 @@ namespace pugi
 		xml_node& operator*() const;
 		xml_node* operator->() const;
 
-		const xml_node_iterator& operator++();
+		xml_node_iterator& operator++();
 		xml_node_iterator operator++(int);
 
-		const xml_node_iterator& operator--();
+		xml_node_iterator& operator--();
 		xml_node_iterator operator--(int);
 	};
 
@@ -893,10 +893,10 @@ namespace pugi
 		xml_attribute& operator*() const;
 		xml_attribute* operator->() const;
 
-		const xml_attribute_iterator& operator++();
+		xml_attribute_iterator& operator++();
 		xml_attribute_iterator operator++(int);
 
-		const xml_attribute_iterator& operator--();
+		xml_attribute_iterator& operator--();
 		xml_attribute_iterator operator--(int);
 	};
 
@@ -929,10 +929,10 @@ namespace pugi
 		xml_node& operator*() const;
 		xml_node* operator->() const;
 
-		const xml_named_node_iterator& operator++();
+		xml_named_node_iterator& operator++();
 		xml_named_node_iterator operator++(int);
 
-		const xml_named_node_iterator& operator--();
+		xml_named_node_iterator& operator--();
 		xml_named_node_iterator operator--(int);
 
 	private: