diff --git a/include/mapnik/markers_symbolizer.hpp b/include/mapnik/markers_symbolizer.hpp
index 7dde57ddb..e8ba4cd0e 100644
--- a/include/mapnik/markers_symbolizer.hpp
+++ b/include/mapnik/markers_symbolizer.hpp
@@ -49,9 +49,14 @@ struct MAPNIK_DECL markers_symbolizer :
         public symbolizer_with_image, public symbolizer_base
 {
 public:
-    explicit markers_symbolizer();
+    markers_symbolizer();
     markers_symbolizer(path_expression_ptr const& filename);
     markers_symbolizer(markers_symbolizer const& rhs);
+
+    void set_width(expression_ptr const& width);
+    expression_ptr const& get_width() const;
+    void set_height(expression_ptr const& height);
+    expression_ptr const& get_height() const;
     void set_ignore_placement(bool ignore_placement);
     bool get_ignore_placement() const;
     void set_allow_overlap(bool overlap);
@@ -60,10 +65,6 @@ public:
     double get_spacing() const;
     void set_max_error(double max_error);
     double get_max_error() const;
-    void set_width(expression_ptr const&width);
-    expression_ptr const& get_width() const;
-    void set_height(expression_ptr const& height);
-    expression_ptr const& get_height() const;
     void set_fill(color const& fill);
     boost::optional<color> get_fill() const;
     void set_stroke(stroke const& stroke);
@@ -71,16 +72,15 @@ public:
     void set_marker_placement(marker_placement_e marker_p);
     marker_placement_e get_marker_placement() const;
 private:
+    expression_ptr width_;
+    expression_ptr height_;
     bool ignore_placement_;
     bool allow_overlap_;
     double spacing_;
     double max_error_;
-    expression_ptr width_;
-    expression_ptr height_;
     boost::optional<color> fill_;
     boost::optional<stroke> stroke_;
     marker_placement_e marker_p_;
-
 };
 
 }
diff --git a/src/markers_symbolizer.cpp b/src/markers_symbolizer.cpp
index 25713755c..0627ea70f 100644
--- a/src/markers_symbolizer.cpp
+++ b/src/markers_symbolizer.cpp
@@ -39,34 +39,34 @@ IMPLEMENT_ENUM( marker_placement_e, marker_placement_strings )
 markers_symbolizer::markers_symbolizer()
     : symbolizer_with_image(path_expression_ptr(new path_expression)),
       symbolizer_base(),
+      width_(),
+      height_(),
       ignore_placement_(false),
       allow_overlap_(false),
       spacing_(100.0),
       max_error_(0.2),
-      width_(boost::make_shared<expr_node>(10.0)),
-      height_(boost::make_shared<expr_node>(10.0)),
       marker_p_(MARKER_LINE_PLACEMENT) {}
 
 markers_symbolizer::markers_symbolizer(path_expression_ptr const& filename)
     : symbolizer_with_image(filename),
       symbolizer_base(),
+      width_(),
+      height_(),
       ignore_placement_(false),
       allow_overlap_(false),
       spacing_(100.0),
       max_error_(0.2),
-      width_(boost::make_shared<expr_node>(10.0)),
-      height_(boost::make_shared<expr_node>(10.0)),
       marker_p_(MARKER_LINE_PLACEMENT) {}
 
 markers_symbolizer::markers_symbolizer(markers_symbolizer const& rhs)
     : symbolizer_with_image(rhs),
       symbolizer_base(rhs),
+      width_(rhs.width_),
+      height_(rhs.height_),
       ignore_placement_(rhs.ignore_placement_),
       allow_overlap_(rhs.allow_overlap_),
       spacing_(rhs.spacing_),
       max_error_(rhs.max_error_),
-      width_(rhs.width_),
-      height_(rhs.height_),
       fill_(rhs.fill_),
       stroke_(rhs.stroke_),
       marker_p_(rhs.marker_p_) {}