diff --git a/lib/6to5/traverse/index.js b/lib/6to5/traverse/index.js
index 32f1a66280..6c95565b04 100644
--- a/lib/6to5/traverse/index.js
+++ b/lib/6to5/traverse/index.js
@@ -65,17 +65,9 @@ var traverse = module.exports = function (parent, callbacks, blacklistTypes) {
         handle(nodes, i);
       });
 
-      // remove deleted nodes
-      parent[key] = _.flatten(parent[key]).filter(function (node) {
-        return node !== traverse.Delete;
-      });
+      parent[key] = _.flatten(parent[key]);
     } else {
       handle(parent, key);
-
-      if (parent[key] === traverse.Delete) {
-        throw new Error("trying to delete property " + key + " from " +
-                        parent.type + " but can't because it's required");
-      }
     }
   });
 };
@@ -96,8 +88,6 @@ traverse.isPattern = function (node) {
   return node.type === "ArrayPattern" || node.type === "ObjectPattern";
 };
 
-traverse.Delete = {};
-
 traverse.hasType = function (tree, type, blacklistTypes) {
   blacklistTypes = [].concat(blacklistTypes || []);