diff --git a/eo/src/gp/parse_tree.h b/eo/src/gp/parse_tree.h
index e18d00c9..ba4a3861 100644
--- a/eo/src/gp/parse_tree.h
+++ b/eo/src/gp/parse_tree.h
@@ -819,7 +819,7 @@ private :
     {
     public:
 
-        using base_iterator::node;
+        using base_const_iterator::node;
 
         typedef std::forward_iterator_tag iterator_category;
         typedef const subtree value_type;