diff --git a/lib/6to5/modules/common.js b/lib/6to5/modules/common.js
index caca9f7a9a..6008d02a18 100644
--- a/lib/6to5/modules/common.js
+++ b/lib/6to5/modules/common.js
@@ -1,15 +1,5 @@
 module.exports = CommonJSModuleFormatter;
 
-var types = require("ast-types");
-var def = types.Type.def;
-
-def("ImportBatchSpecifier")
-  .bases("Specifier")
-  .build("id")
-  .field("id", def("Identifier"));
-
-types.finalize();
-
 var util = require("../util");
 var b    = require("recast").types.builders;
 
diff --git a/lib/6to5/transformers/modules.js b/lib/6to5/transformers/modules.js
index c93aab04bc..4d7076239f 100644
--- a/lib/6to5/transformers/modules.js
+++ b/lib/6to5/transformers/modules.js
@@ -1,4 +1,13 @@
-var _ = require("lodash");
+var types = require("ast-types");
+var _     = require("lodash");
+var def   = types.Type.def;
+
+def("ImportBatchSpecifier")
+  .bases("Specifier")
+  .build("id")
+  .field("id", def("Identifier"));
+
+types.finalize();
 
 exports.ImportDeclaration = function (node, parent, file) {
   var nodes = [];