diff --git a/include/mapnik/feature_style_processor.hpp b/include/mapnik/feature_style_processor.hpp
index 875d7500c..553a263c4 100644
--- a/include/mapnik/feature_style_processor.hpp
+++ b/include/mapnik/feature_style_processor.hpp
@@ -67,9 +67,10 @@ class feature_style_processor
         proj_transform const& prj_trans_;
     };
 public:
-    feature_style_processor(Map const& m)
-        : m_(m) {}
-         
+    explicit feature_style_processor(Map const& m, double scale_factor = 1.0)
+        : m_(m),
+          scale_factor_(scale_factor) {}
+    
     void apply()
     {
 #ifdef MAPNIK_DEBUG           
@@ -82,6 +83,7 @@ public:
         {
             projection proj(m_.srs()); // map projection
             double scale_denom = mapnik::scale_denominator(m_,proj.is_geographic());
+            scale_denom *= scale_factor_;
 #ifdef MAPNIK_DEBUG
             std::clog << "scale denominator = " << scale_denom << "\n";
 #endif
@@ -253,6 +255,7 @@ private:
         p.end_layer_processing(lay);
     }   
     Map const& m_;
+    double scale_factor_;
 };
 }
 
diff --git a/src/agg_renderer.cpp b/src/agg_renderer.cpp
index bd83e8201..8d8dcca63 100644
--- a/src/agg_renderer.cpp
+++ b/src/agg_renderer.cpp
@@ -109,7 +109,7 @@ private:
 
 template <typename T>
 agg_renderer<T>::agg_renderer(Map const& m, T & pixmap, double scale_factor, unsigned offset_x, unsigned offset_y)
-    : feature_style_processor<agg_renderer>(m),
+    : feature_style_processor<agg_renderer>(m, scale_factor),
       pixmap_(pixmap),
       width_(pixmap_.width()),
       height_(pixmap_.height()),