diff --git a/src/document/Document.js b/src/document/Document.js
index 60ad0313..7b67cab4 100644
--- a/src/document/Document.js
+++ b/src/document/Document.js
@@ -59,8 +59,8 @@ var Document = this.Document = Base.extend({
 		this.bounds = Rectangle.create(0, 0, this._size.width,
 				this._size.height);
 		this.context = this.canvas.getContext('2d');
-		// Push it onto paper.documents and adjust index in one:
-		Base.splice(paper.documents, [this]);
+		// Push it onto paper.documents and set index:
+		this._index = paper.documents.push(this) - 1;
 		this.activate();
 		this.layers = [];
 		this.activeLayer = new Layer();
diff --git a/src/item/Layer.js b/src/item/Layer.js
index faaa7a52..f2e17549 100644
--- a/src/item/Layer.js
+++ b/src/item/Layer.js
@@ -20,8 +20,8 @@ var Layer = this.Layer = Group.extend({
 	initialize: function() {
 		this.children = [];
 		this._document = paper.document;
-		// Push it onto document.layers and adjust index in one:
-		Base.splice(this._document.layers, [this]);
+		// Push it onto document.layers and set index:
+		this._index = this._document.layers.push(this) - 1;
 		this.activate();
 	},