diff --git a/src/Legend.vala b/src/Legend.vala
index 56ab9e3..ca73e3e 100644
--- a/src/Legend.vala
+++ b/src/Legend.vala
@@ -154,7 +154,7 @@ namespace CairoChart {
 					s.line_style.apply(chart);
 					chart.ctx.rel_line_to (line_length, 0);
 					chart.ctx.stroke();
-					s.marker.draw_at_pos (chart, x + line_length / 2, y - title_sz.height / 2);
+					s.marker.draw_at_pos (x + line_length / 2, y - title_sz.height / 2);
 					break;
 				}
 
diff --git a/src/Marker.vala b/src/Marker.vala
index 784b172..dde672f 100644
--- a/src/Marker.vala
+++ b/src/Marker.vala
@@ -5,6 +5,8 @@ namespace CairoChart {
 	 */
 	public class Marker {
 
+		Chart chart = null;
+
 		/**
 		 * ``Marker`` shape.
 		 */
@@ -33,9 +35,11 @@ namespace CairoChart {
 		 * @param type ``Marker`` shape.
 		 * @param size ``Marker`` size.
 		 */
-		public Marker (Type type = Type.NONE,
+		public Marker (Chart chart,
+		               Type type = Type.NONE,
 		               double size = 8.0
 		) {
+			this.chart = chart;
 			this.type = type;
 			this.size = size;
 		}
@@ -44,7 +48,7 @@ namespace CairoChart {
 		 * Gets a copy of the ``Marker``.
 		 */
 		public virtual Marker copy () {
-			return new Marker (type, size);
+			return new Marker (chart, type, size);
 		}
 
 		/**
@@ -52,7 +56,7 @@ namespace CairoChart {
 		 * @param x x-coordinate.
 		 * @param y y-coordinate.
 		 */
-		public virtual void draw_at_pos (Chart chart, double x, double y) {
+		public virtual void draw_at_pos (double x, double y) {
 			chart.ctx.move_to (x, y);
 			switch (type) {
 			case Type.SQUARE:
diff --git a/src/Series.vala b/src/Series.vala
index 1f153d2..949b9ad 100644
--- a/src/Series.vala
+++ b/src/Series.vala
@@ -17,7 +17,7 @@ namespace CairoChart {
 
 		public Place place = new Place();
 		public Text title = new Text ();
-		public Marker marker = new Marker ();
+		public Marker marker = null;
 
 		public Grid grid = new Grid ();
 
@@ -45,6 +45,7 @@ namespace CairoChart {
 
 		public Series (Chart chart) {
 			this.chart = chart;
+			this.marker = new Marker(chart);
 		}
 
 		public virtual Series copy () {
@@ -86,7 +87,7 @@ namespace CairoChart {
 				var y = get_scr_y(points[i].y);
 				if (Math.point_in_rect (Point(x, y), chart.plarea.x0, chart.plarea.x1,
 				                                     chart.plarea.y0, chart.plarea.y1))
-					marker.draw_at_pos(chart, x, y);
+					marker.draw_at_pos(x, y);
 			}
 		}