diff --git a/include/mapnik/json/extract_bounding_box_grammar.hpp b/include/mapnik/json/extract_bounding_box_grammar.hpp
index 2df4def47..906e7126d 100644
--- a/include/mapnik/json/extract_bounding_box_grammar.hpp
+++ b/include/mapnik/json/extract_bounding_box_grammar.hpp
@@ -32,53 +32,19 @@
 #pragma GCC diagnostic push
 #include <mapnik/warning_ignore.hpp>
 #include <boost/spirit/include/qi.hpp>
-#include <boost/spirit/include/phoenix_function.hpp>
 #pragma GCC diagnostic pop
 
 namespace mapnik { namespace json {
 
-using position_type = mapnik::geometry::point<double>;
-using box_type = box2d<double>;
-using boxes_type = std::vector<std::pair<box_type, std::pair<std::size_t, std::size_t>>>;
-
 namespace qi = boost::spirit::qi;
 
-struct calculate_bounding_box_impl
-{
-    using result_type = void;
-    template <typename T0, typename T1>
-    result_type operator() (T0 & bbox, T1 const& pos) const
-    {
-        if (pos)
-        {
-            double x = pos->x;
-            double y = pos->y;
-            if (!bbox.valid())
-            {
-                bbox.init(x, y, x, y); //TODO: add init(x,y) convinience method
-            }
-            else
-            {
-                bbox.expand_to_include(x, y);
-            }
-        }
-    }
-};
-
-struct push_box_impl
-{
-    using result_type = void;
-    template <typename T0, typename T1, typename T2, typename T3>
-    void operator() (T0 & boxes, T1 const& begin, T2 const& box, T3 const& range) const
-    {
-        if (box.valid()) boxes.emplace_back(box, std::make_pair(std::distance(begin, range.begin()), std::distance(range.begin(), range.end())));
-    }
-};
-
-template <typename Iterator, typename Boxes = boxes_type, typename ErrorHandler = error_handler<Iterator> >
+template <typename Iterator, typename Boxes, typename ErrorHandler = error_handler<Iterator> >
 struct extract_bounding_box_grammar :
         qi::grammar<Iterator, void(Boxes&), space_type>
 {
+    using position_type = mapnik::geometry::point<double>;
+    using boxes_type = Boxes;
+    using box_type = typename Boxes::value_type::first_type;
     extract_bounding_box_grammar();
     // rules
     qi::rule<Iterator, void(boxes_type&), space_type> start;
@@ -91,11 +57,6 @@ struct extract_bounding_box_grammar :
     qi::rule<Iterator, void(box_type&), space_type> rings_array;
     // generic JSON support
     json::generic_json<Iterator> json;
-    // phoenix functions
-    boost::phoenix::function<push_box_impl> push_box;
-    boost::phoenix::function<calculate_bounding_box_impl> calculate_bounding_box;
-    // error handler
-    boost::phoenix::function<ErrorHandler> const error_handler;
 };
 
 }}
diff --git a/include/mapnik/json/extract_bounding_box_grammar_impl.hpp b/include/mapnik/json/extract_bounding_box_grammar_impl.hpp
index f2a89d5c1..8a7fc331c 100644
--- a/include/mapnik/json/extract_bounding_box_grammar_impl.hpp
+++ b/include/mapnik/json/extract_bounding_box_grammar_impl.hpp
@@ -29,12 +29,48 @@
 #include <boost/spirit/include/phoenix_stl.hpp>
 #include <boost/spirit/include/phoenix_operator.hpp>
 #include <boost/spirit/repository/include/qi_iter_pos.hpp>
+#include <boost/spirit/include/phoenix_function.hpp>
 // stl
 #include <iostream>
 #include <string>
 
 namespace mapnik { namespace json {
 
+struct calculate_bounding_box_impl
+{
+    using result_type = void;
+    template <typename T0, typename T1>
+    result_type operator() (T0 & bbox, T1 const& pos) const
+    {
+        if (pos)
+        {
+            typename T0::value_type x = pos->x;
+            typename T0::value_type y = pos->y;
+            if (!bbox.valid())
+            {
+                bbox.init(x, y);
+            }
+            else
+            {
+                bbox.expand_to_include(x, y);
+            }
+        }
+    }
+};
+
+struct push_box_impl
+{
+    using result_type = void;
+    template <typename T0, typename T1, typename T2, typename T3>
+    void operator() (T0 & boxes, T1 const& begin, T2 const& box, T3 const& range) const
+    {
+        if (box.valid()) boxes.emplace_back(box,
+                                            std::make_pair(std::distance(begin,
+                                                                         range.begin()),
+                                                           std::distance(range.begin(), range.end())));
+    }
+};
+
 namespace repo = boost::spirit::repository;
 
 template <typename Iterator, typename Boxes, typename ErrorHandler>
@@ -61,6 +97,12 @@ extract_bounding_box_grammar<Iterator, Boxes, ErrorHandler>::extract_bounding_bo
     using qi::fail;
     using qi::on_error;
 
+    // phoenix functions
+    boost::phoenix::function<push_box_impl> push_box;
+    boost::phoenix::function<calculate_bounding_box_impl> calculate_bounding_box;
+    // error handler
+    boost::phoenix::function<ErrorHandler> const error_handler;
+
     start = features(_r1)
         ;