diff --git a/include/mapnik/json/topojson_utils.hpp b/include/mapnik/json/topojson_utils.hpp
index 8cd92100b..506a0fbfa 100644
--- a/include/mapnik/json/topojson_utils.hpp
+++ b/include/mapnik/json/topojson_utils.hpp
@@ -120,7 +120,7 @@ struct bounding_box_visitor : public boost::static_visitor<box2d<double> >
     }
 
 private:
-    topology topo_;
+    topology const& topo_;
 };
 
 }}
diff --git a/plugins/input/topojson/topojson_featureset.cpp b/plugins/input/topojson/topojson_featureset.cpp
index e36702d87..beaf122fc 100644
--- a/plugins/input/topojson/topojson_featureset.cpp
+++ b/plugins/input/topojson/topojson_featureset.cpp
@@ -45,6 +45,8 @@ mapnik::feature_ptr topojson_featureset::next()
         std::size_t index = *index_itr_++;
         if ( index < topo_.geometries.size())
         {
+            mapnik::topojson::geometry const& geom = topo_.geometries[index];
+
             return mapnik::feature_ptr(); // TODO
         }
     }