diff --git a/lib/6to5/transformation/modules/amd.js b/lib/6to5/transformation/modules/amd.js
index 9a26d52b8f..60a18b4166 100644
--- a/lib/6to5/transformation/modules/amd.js
+++ b/lib/6to5/transformation/modules/amd.js
@@ -78,7 +78,7 @@ AMDFormatter.prototype.importSpecifier = function (specifier, node, nodes) {
 
   if (t.isImportBatchSpecifier(specifier)) {
     // import * as bar from "foo";
-  } else if (specifier.default) {
+  } else if (t.isSpecifierDefault(specifier)) {
     // import foo from "foo";
     ref = t.callExpression(this.file.addDeclaration("interop-require"), [ref]);
   } else {
diff --git a/lib/6to5/types/index.js b/lib/6to5/types/index.js
index 323e985ac8..65fb12bedc 100644
--- a/lib/6to5/types/index.js
+++ b/lib/6to5/types/index.js
@@ -307,3 +307,7 @@ t.inherits = function (child, parent) {
 t.getSpecifierName = function (specifier) {
   return specifier.name || specifier.id;
 };
+
+t.isSpecifierDefault = function (specifier) {
+  return t.isIdentifier(specifier.id) && specifier.id.name === "default";
+};
diff --git a/test/fixtures/transformation/es6-modules-amd/imports-default/expected.js b/test/fixtures/transformation/es6-modules-amd/imports-default/expected.js
index 43e1ab9d53..b19c21fa34 100644
--- a/test/fixtures/transformation/es6-modules-amd/imports-default/expected.js
+++ b/test/fixtures/transformation/es6-modules-amd/imports-default/expected.js
@@ -7,5 +7,5 @@ define(["exports", "foo"], function (exports, _foo) {
 
   var foo = _interopRequire(_foo);
 
-  var foo = _foo["default"];
+  var foo = _interopRequire(_foo);
 });
diff --git a/test/fixtures/transformation/es6-modules-umd/imports-default/expected.js b/test/fixtures/transformation/es6-modules-umd/imports-default/expected.js
index b68de76392..83402d6e59 100644
--- a/test/fixtures/transformation/es6-modules-umd/imports-default/expected.js
+++ b/test/fixtures/transformation/es6-modules-umd/imports-default/expected.js
@@ -13,5 +13,5 @@
 
   var foo = _interopRequire(_foo);
 
-  var foo = _foo["default"];
+  var foo = _interopRequire(_foo);
 });