diff --git a/.zap/traverse.js b/.zap/traverse.js
index 9afac7e9..c7adcb45 100644
--- a/.zap/traverse.js
+++ b/.zap/traverse.js
@@ -1,5 +1,5 @@
 function listChildren(node, level) {
-  let j
+  var j
   for (j = 0; j < node.getChildCount(); j++) {
     print(Array(level + 1).join('    ') + node.getChildAt(j).getNodeName())
     listChildren(node.getChildAt(j), level + 1)