diff --git a/lib/6to5/patch.js b/lib/6to5/patch.js
index f846fdf2f0..836538b2f8 100644
--- a/lib/6to5/patch.js
+++ b/lib/6to5/patch.js
@@ -1,22 +1,17 @@
 var t = require("./types");
 var _ = require("lodash");
 
+// estraverse
+
+var estraverse = require("estraverse");
+_.extend(estraverse.VisitorKeys, t.VISITOR_KEYS);
+
+// regenerator/recast/ast-types
+
 var types = require("ast-types");
 var def   = types.Type.def;
 var or    = types.Type.or;
 
-// Program wrapper
-def("File")
-  .bases("Node")
-  .build("program")
-  .field("program", def("Program"));
-
-// Non-standard Acorn type
-def("ParenthesizedExpression")
-  .bases("Expression")
-  .build("expression")
-  .field("expression", def("Expression"));
-
 // Acorn - Same as ImportNamespaceSpecifier but `id` is `name`
 def("ImportBatchSpecifier")
   .bases("Specifier")
@@ -50,6 +45,3 @@ def("BindFunctionExpression")
   .field("arguments", [def("Expression")]);
 
 types.finalize();
-
-var estraverse = require("estraverse");
-_.extend(estraverse.VisitorKeys, t.VISITOR_KEYS);