diff --git a/src/pixi/core/Circle.js b/src/pixi/core/Circle.js
index 7a0f8af..088156b 100644
--- a/src/pixi/core/Circle.js
+++ b/src/pixi/core/Circle.js
@@ -37,7 +37,7 @@
  * @method clone
  * @return a copy of the polygon
  */
-PIXI.Circle.clone = function()
+PIXI.Circle.prototype.clone = function()
 {
     return new PIXI.Circle(this.x, this.y, this.radius);
 }
@@ -48,7 +48,7 @@
  * @param y {Number} The Y coord of the point to test
  * @return if the x/y coords are within this polygon
  */
-PIXI.Circle.contains = function(x, y)
+PIXI.Circle.prototype.contains = function(x, y)
 {
     if(this.radius <= 0)
         return false;

diff --git a/src/pixi/core/Circle.js b/src/pixi/core/Circle.js
index 7a0f8af..088156b 100644
--- a/src/pixi/core/Circle.js
+++ b/src/pixi/core/Circle.js
@@ -37,7 +37,7 @@
  * @method clone
  * @return a copy of the polygon
  */
-PIXI.Circle.clone = function()
+PIXI.Circle.prototype.clone = function()
 {
     return new PIXI.Circle(this.x, this.y, this.radius);
 }
@@ -48,7 +48,7 @@
  * @param y {Number} The Y coord of the point to test
  * @return if the x/y coords are within this polygon
  */
-PIXI.Circle.contains = function(x, y)
+PIXI.Circle.prototype.contains = function(x, y)
 {
     if(this.radius <= 0)
         return false;
diff --git a/src/pixi/core/Ellipse.js b/src/pixi/core/Ellipse.js
index 0330766..e28b9a9 100644
--- a/src/pixi/core/Ellipse.js
+++ b/src/pixi/core/Ellipse.js
@@ -45,7 +45,7 @@
  * @method clone
  * @return a copy of the polygon
  */
-PIXI.Ellipse.clone = function()
+PIXI.Ellipse.prototype.clone = function()
 {
     return new PIXI.Ellipse(this.x, this.y, this.width, this.height);
 }
@@ -56,7 +56,7 @@
  * @param y {Number} The Y coord of the point to test
  * @return if the x/y coords are within this polygon
  */
-PIXI.Ellipse.contains = function(x, y)
+PIXI.Ellipse.prototype.contains = function(x, y)
 {
     if(this.width <= 0 || this.height <= 0)
         return false;

diff --git a/src/pixi/core/Circle.js b/src/pixi/core/Circle.js
index 7a0f8af..088156b 100644
--- a/src/pixi/core/Circle.js
+++ b/src/pixi/core/Circle.js
@@ -37,7 +37,7 @@
  * @method clone
  * @return a copy of the polygon
  */
-PIXI.Circle.clone = function()
+PIXI.Circle.prototype.clone = function()
 {
     return new PIXI.Circle(this.x, this.y, this.radius);
 }
@@ -48,7 +48,7 @@
  * @param y {Number} The Y coord of the point to test
  * @return if the x/y coords are within this polygon
  */
-PIXI.Circle.contains = function(x, y)
+PIXI.Circle.prototype.contains = function(x, y)
 {
     if(this.radius <= 0)
         return false;
diff --git a/src/pixi/core/Ellipse.js b/src/pixi/core/Ellipse.js
index 0330766..e28b9a9 100644
--- a/src/pixi/core/Ellipse.js
+++ b/src/pixi/core/Ellipse.js
@@ -45,7 +45,7 @@
  * @method clone
  * @return a copy of the polygon
  */
-PIXI.Ellipse.clone = function()
+PIXI.Ellipse.prototype.clone = function()
 {
     return new PIXI.Ellipse(this.x, this.y, this.width, this.height);
 }
@@ -56,7 +56,7 @@
  * @param y {Number} The Y coord of the point to test
  * @return if the x/y coords are within this polygon
  */
-PIXI.Ellipse.contains = function(x, y)
+PIXI.Ellipse.prototype.contains = function(x, y)
 {
     if(this.width <= 0 || this.height <= 0)
         return false;
diff --git a/src/pixi/core/Polygon.js b/src/pixi/core/Polygon.js
index a433bb4..96edc75 100644
--- a/src/pixi/core/Polygon.js
+++ b/src/pixi/core/Polygon.js
@@ -29,7 +29,7 @@
  * @method clone
  * @return a copy of the polygon
  */
-PIXI.Polygon.clone = function()
+PIXI.Polygon.prototype.clone = function()
 {
 	var points = [];
 	for (var i=0; i<this.points.length; i++) {
@@ -45,7 +45,7 @@
  * @param y {Number} The Y coord of the point to test
  * @return if the x/y coords are within this polygon
  */
-PIXI.Polygon.contains = function(x, y)
+PIXI.Polygon.prototype.contains = function(x, y)
 {
     var inside = false;