diff --git a/include/mapnik/json/feature_generator_grammar.hpp b/include/mapnik/json/feature_generator_grammar.hpp
index 5df0cf938..09edbec7b 100644
--- a/include/mapnik/json/feature_generator_grammar.hpp
+++ b/include/mapnik/json/feature_generator_grammar.hpp
@@ -86,7 +86,7 @@ struct end_container<mapnik::kv_store const>
 
 BOOST_FUSION_ADAPT_ADT(
     mapnik::feature_impl,
-    (int, int, obj.id(), /**/)
+    (mapnik::value_integer, mapnik::value_integer, obj.id(), /**/)
     (mapnik::geometry::geometry<double>const&, mapnik::geometry::geometry<double> const&, obj.get_geometry(),/**/)
     (mapnik::kv_store const, mapnik::kv_store const, mapnik::kv_store(obj), /**/))
 
diff --git a/include/mapnik/json/feature_generator_grammar_impl.hpp b/include/mapnik/json/feature_generator_grammar_impl.hpp
index fd65e7320..6b977d85d 100644
--- a/include/mapnik/json/feature_generator_grammar_impl.hpp
+++ b/include/mapnik/json/feature_generator_grammar_impl.hpp
@@ -29,10 +29,10 @@ feature_generator_grammar<OutputIterator, FeatureType>::feature_generator_gramma
   : feature_generator_grammar::base_type(feature)
 {
     boost::spirit::karma::lit_type lit;
-    boost::spirit::karma::int_type int_;
+    boost::spirit::karma::long_long_type id;
 
     feature  = lit("{\"type\":\"Feature\"")
-        << lit(",\"id\":") << int_
+        << lit(",\"id\":") << id
         << lit(",\"geometry\":") << geometry
         << lit(",\"properties\":") << properties
         << lit('}')