diff --git a/lib/canvas.js b/lib/canvas.js
index cc2f659..adcb393 100644
--- a/lib/canvas.js
+++ b/lib/canvas.js
@@ -84,7 +84,7 @@ Canvas.prototype.inspect = function(){
 
 Canvas.prototype.getContext = function(contextId){
   if ('2d' == contextId) {
-    var ctx = new Context2d(this);
+    var ctx = this._context2d || (this._context2d = new Context2d(this));
     this.context = ctx;
     ctx.canvas = this;
     return ctx;