diff --git a/include/mapnik/agg_renderer.hpp b/include/mapnik/agg_renderer.hpp
index ebe8bec02..907de2edd 100644
--- a/include/mapnik/agg_renderer.hpp
+++ b/include/mapnik/agg_renderer.hpp
@@ -70,8 +70,8 @@ public:
     void end_map_processing(Map const& map);
     void start_layer_processing(layer const& lay);
     void end_layer_processing(layer const& lay);
-    void render_marker(const int x, const int y, marker &marker, const agg::trans_affine & tr, double opacity);
-
+    void render_marker(int x, int y, marker & marker, agg::trans_affine const& tr, double opacity);
+    
     void process(point_symbolizer const& sym,
                  mapnik::feature_ptr const& feature,
                  proj_transform const& prj_trans);
diff --git a/src/agg/agg_renderer.cpp b/src/agg/agg_renderer.cpp
index ca9b81f83..04098820b 100644
--- a/src/agg/agg_renderer.cpp
+++ b/src/agg/agg_renderer.cpp
@@ -223,7 +223,7 @@ void agg_renderer<T>::end_layer_processing(layer const&)
 }
 
 template <typename T>
-void agg_renderer<T>::render_marker(const int x, const int y, marker &marker, const agg::trans_affine & tr, double opacity)
+void agg_renderer<T>::render_marker(int x, int y, marker & marker, agg::trans_affine const& tr, double opacity)
 {
     if (marker.is_vector())
     {