diff --git a/src/build.js b/src/build.js
index 8b4680b5..af6ae737 100644
--- a/src/build.js
+++ b/src/build.js
@@ -1,3 +1,5 @@
+(function(scope) {
+
 #include "Paper.js"
 
 #include "basic/Point.js"
@@ -33,3 +35,16 @@
 #include "tool/ToolEvent.js"
 #include "tool/ToolHandler.js"
 #include "tool/Tool.js"
+
+// Now inject all these local prototypes into the paper scope.
+Base.each(['Point', 'Size', 'Rectangle', 'Matrix', 'DocumentView', 'Doc',
+	'Symbol', 'Item', 'Group', 'Layer', 'Raster', 'PlacedSymbol', 'PathStyle',
+	'Segment', 'Curve', 'PathItem', 'Path', 'CompoundPath', 'Color', 'RGBColor',
+	'GrayColor', 'GradientColor', 'Gradient', 'GradientStop', 'ToolEvent',
+	'ToolHandler', 'Tool'],
+	function(name) {
+		scope[name] = eval(name);
+	}
+);
+
+})(this);