diff --git a/lib/6to5/traverse/index.js b/lib/6to5/traverse/index.js
index a6fe9c1efe..04adfd5a50 100644
--- a/lib/6to5/traverse/index.js
+++ b/lib/6to5/traverse/index.js
@@ -82,6 +82,10 @@ traverse.isFunction = function (node) {
   return _.contains(traverse.FUNCTION_TYPES, node.type);
 };
 
+traverse.isPattern = function (node) {
+  return node.type === "ArrayPattern" || node.type === "ObjectPattern";
+};
+
 traverse.Delete = {};
 
 traverse.hasType = function (tree, type, blacklistTypes) {
diff --git a/lib/6to5/util.js b/lib/6to5/util.js
index 3ab08d6900..9826858d1b 100644
--- a/lib/6to5/util.js
+++ b/lib/6to5/util.js
@@ -20,10 +20,6 @@ exports.ensureBlock = function (node) {
   node.body = b.blockStatement(block);
 };
 
-exports.isPattern = function (node) {
-  return node.type === "ArrayPattern" || node.type === "ObjectPattern";
-};
-
 exports.isAbsolute = function (loc) {
   if (!loc) return false;
   if (loc[0] === "/") return true; // unix