diff --git a/lib/6to5/transformation/transformers/es6/destructuring.js b/lib/6to5/transformation/transformers/es6/destructuring.js
index 7e26902dd3..ba3cd553df 100644
--- a/lib/6to5/transformation/transformers/es6/destructuring.js
+++ b/lib/6to5/transformation/transformers/es6/destructuring.js
@@ -179,21 +179,40 @@ Destructuring.prototype.init = function (pattern, parentId) {
 
 exports.ForInStatement =
 exports.ForOfStatement = function (node, parent, scope, file) {
-  var declar = node.left;
-  if (!t.isVariableDeclaration(declar)) return;
+  var left = node.left;
 
-  var pattern = declar.declarations[0].id;
+  if (t.isPattern(left)) {
+    // for ({ length: k } in { abc: 3 });
+
+    var temp = scope.generateUidIdentifier("ref");
+
+    node.left = t.variableDeclaration("var", [
+      t.variableDeclarator(temp)
+    ]);
+
+    t.ensureBlock(node);
+
+    node.body.body.unshift(t.variableDeclaration("var", [
+      t.variableDeclarator(left, temp)
+    ]));
+
+    return;
+  }
+
+  if (!t.isVariableDeclaration(left)) return;
+
+  var pattern = left.declarations[0].id;
   if (!t.isPattern(pattern)) return;
 
   var key = scope.generateUidIdentifier("ref");
-  node.left = t.variableDeclaration(declar.kind, [
+  node.left = t.variableDeclaration(left.kind, [
     t.variableDeclarator(key, null)
   ]);
 
   var nodes = [];
 
   var destructuring = new Destructuring({
-    kind: declar.kind,
+    kind: left.kind,
     file: file,
     scope: scope,
     nodes: nodes
@@ -248,7 +267,7 @@ exports.CatchClause = function (node, parent, scope, file) {
   var nodes = [];
 
   var destructuring = new Destructuring({
-    kind: "var",
+    kind: "let",
     file: file,
     scope: scope,
     nodes: nodes
@@ -256,6 +275,8 @@ exports.CatchClause = function (node, parent, scope, file) {
   destructuring.init(pattern, ref);
 
   node.body.body = nodes.concat(node.body.body);
+
+  return node;
 };
 
 exports.ExpressionStatement = function (node, parent, scope, file) {