diff --git a/src/hierarchy/iterator.js b/src/hierarchy/iterator.js
index 7e06b620..3a17c6fd 100644
--- a/src/hierarchy/iterator.js
+++ b/src/hierarchy/iterator.js
@@ -1,12 +1,12 @@
 export default function*() {
-  var node = this, current, next = [node], children, i, n;
+  let node = this, current, next = [node], children;
   do {
-    current = next.reverse(), next = [];
+    current = next, next = [];
     while (node = current.pop()) {
       yield node;
       if (children = node.children) {
-        for (i = 0, n = children.length; i < n; ++i) {
-          next.push(children[i]);
+        for (let i = 0; i < children.length; ++i) {
+          next.unshift(children[i]);
         }
       }
     }