diff --git a/include/mapnik/json/attribute_value_visitor.hpp b/include/mapnik/json/attribute_value_visitor.hpp
index dd27495ca..206530cae 100644
--- a/include/mapnik/json/attribute_value_visitor.hpp
+++ b/include/mapnik/json/attribute_value_visitor.hpp
@@ -48,7 +48,7 @@ public:
         return mapnik::value(tr_.transcode(str.c_str()));
     }
 
-    mapnik::value operator()(std::unordered_map<std::string, mapnik::json::json_value> const& object) const
+    mapnik::value operator()(std::vector<std::pair<std::string, mapnik::json::json_value> > const& object) const
     {
         std::string str = stringifier()(object);
         return mapnik::value(tr_.transcode(str.c_str()));
diff --git a/include/mapnik/json/generic_json.hpp b/include/mapnik/json/generic_json.hpp
index 35fdeed03..92f27455d 100644
--- a/include/mapnik/json/generic_json.hpp
+++ b/include/mapnik/json/generic_json.hpp
@@ -35,7 +35,6 @@
 #pragma GCC diagnostic pop
 
 #include <vector>
-#include <unordered_map>
 
 namespace mapnik { namespace json {
 
@@ -47,8 +46,8 @@ using space_type = standard::space_type;
 struct json_value;
 
 using json_array = std::vector<json_value>;
-using json_object = std::unordered_map<std::string, json_value>;
 using json_object_element = std::pair<std::string, json_value>;
+using json_object = std::vector<json_object_element>;
 using json_value_base = mapnik::util::variant<value_null,
                                               value_bool,
                                               value_integer,
@@ -169,7 +168,7 @@ struct generic_json
     qi::rule<Iterator, json_value(), space_type> value;
     qi::int_parser<mapnik::value_integer, 10, 1, -1> int__;
     unicode_string<Iterator> string_;
-    qi::rule<Iterator, json_object_element, space_type> key_value;
+    qi::rule<Iterator, json_object_element(), space_type> key_value;
     qi::rule<Iterator, json_value(), space_type> number;
     qi::rule<Iterator, json_object(), space_type> object;
     qi::rule<Iterator, json_array(), space_type> array;
diff --git a/include/mapnik/json/stringifier.hpp b/include/mapnik/json/stringifier.hpp
index c8a4b2665..93906f6ec 100644
--- a/include/mapnik/json/stringifier.hpp
+++ b/include/mapnik/json/stringifier.hpp
@@ -78,7 +78,7 @@ struct stringifier
         return str;
     }
 
-    std::string operator()(std::unordered_map<std::string, mapnik::json::json_value> const& object) const
+    std::string operator()(std::vector<std::pair<std::string, mapnik::json::json_value>> const& object) const
     {
         std::string str = "{";
         bool first = true;