diff --git a/src/treemap.js b/src/treemap.js
index <HASH>..<HASH> 100644
--- a/src/treemap.js
+++ b/src/treemap.js
@@ -10,7 +10,7 @@ var modes = {
 };
 
 function padNone(node) {
-  return {x: node.x, y: node.y, dx: node.dx, dy: node.dy};
+  return node;
 }
 
 function padStandard(node, padding) {
Use identity function for padNone.

Since we don’t modify rect.