diff --git a/src/easeljs/display/DisplayObject.js b/src/easeljs/display/DisplayObject.js
index 3ce9e90c3..c156ac224 100644
--- a/src/easeljs/display/DisplayObject.js
+++ b/src/easeljs/display/DisplayObject.js
@@ -1163,8 +1163,8 @@ this.createjs = this.createjs||{};
 	 * @param {Number} height The height of the bounds.
 	 **/
 	p.setBounds = function(x, y, width, height) {
-		if (x == null) { this._bounds = x; }
-		this._bounds = (this._bounds || new createjs.Rectangle()).setValues(x, y, width, height);
+		if (x == null) { this._bounds = null; }
+		else { this._bounds = (this._bounds || new createjs.Rectangle()).setValues(x, y, width, height); }
 	};
 
 	/**