diff --git a/lib/6to5/generation/node.js b/lib/6to5/generation/node.js
index 23d260901f..560ba9d9bf 100644
--- a/lib/6to5/generation/node.js
+++ b/lib/6to5/generation/node.js
@@ -8,6 +8,8 @@ function Node(node, parent) {
   this.node   = node;
 }
 
+//
+
 Node.whitespace = {
   FunctionExpression: 1,
   FunctionStatement: 1,
@@ -27,6 +29,29 @@ _.each(Node.whitespace, function (amounts, type) {
   Node.whitespace[type] = amounts;
 });
 
+//
+
+Node.PRECEDENCE = {};
+
+_.each([
+  ["||"],
+  ["&&"],
+  ["|"],
+  ["^"],
+  ["&"],
+  ["==", "===", "!=", "!=="],
+  ["<", ">", "<=", ">=", "in", "instanceof"],
+  [">>", "<<", ">>>"],
+  ["+", "-"],
+  ["*", "/", "%"]
+], function (tier, i) {
+  _.each(tier, function (op) {
+    Node.PRECEDENCE[op] = i;
+  });
+});
+
+//
+
 Node.prototype.needsWhitespace = function (type) {
   var node = this.node;
   if (!node) return 0;
@@ -109,10 +134,10 @@ Node.prototype.needsParans = function () {
 
     if (t.isBinary(parent)) {
       var parentOp  = parent.operator;
-      var parentPos = t.PRECEDENCE[parentOp];
+      var parentPos = Node.PRECEDENCE[parentOp];
 
       var nodeOp = node.operator;
-      var nodePos = t.PRECEDENCE[nodeOp];
+      var nodePos = Node.PRECEDENCE[nodeOp];
 
       if (parentPos > nodePos) {
         return true;