diff --git a/lib/6to5/transformation/modules/_default.js b/lib/6to5/transformation/modules/_default.js
index 05055da5ec..97c3a9fcb8 100644
--- a/lib/6to5/transformation/modules/_default.js
+++ b/lib/6to5/transformation/modules/_default.js
@@ -27,6 +27,10 @@ function DefaultFormatter(file) {
   this.remapAssignments();
 }
 
+DefaultFormatter.prototype.doDefaultExportInterop = function (node) {
+  return node.default && !this.noInteropRequire && !this.hasNonDefaultExports;
+};
+
 DefaultFormatter.prototype.bumpImportOccurences = function (node) {
   var source = node.source.value;
   var occurs = this.localImportOccurences;
diff --git a/lib/6to5/transformation/modules/common.js b/lib/6to5/transformation/modules/common.js
index 0e0844ef54..376e97eca2 100644
--- a/lib/6to5/transformation/modules/common.js
+++ b/lib/6to5/transformation/modules/common.js
@@ -60,10 +60,6 @@ CommonJSFormatter.prototype.importDeclaration = function (node, nodes) {
   }, true));
 };
 
-CommonJSFormatter.prototype.doDefaultExportInterop = function (node) {
-  return node.default && !this.noInteropRequire && !this.hasNonDefaultExports;
-};
-
 CommonJSFormatter.prototype.exportDeclaration = function (node, nodes) {
   if (this.doDefaultExportInterop(node)) {
     var declar = node.declaration;