diff --git a/lib/6to5/transformation/modules/_strict.js b/lib/6to5/transformation/modules/_strict.js
new file mode 100644
index 0000000000..de55735733
--- /dev/null
+++ b/lib/6to5/transformation/modules/_strict.js
@@ -0,0 +1,14 @@
+"use strict";
+
+var util = require("../../util");
+
+module.exports = function (Parent) {
+  var Constructor = function () {
+    this.noInteropRequire = true;
+    Parent.apply(this, arguments);
+  };
+
+  util.inherits(Constructor, Parent);
+
+  return Constructor;
+};
diff --git a/lib/6to5/transformation/modules/amd-strict.js b/lib/6to5/transformation/modules/amd-strict.js
new file mode 100644
index 0000000000..a055b94763
--- /dev/null
+++ b/lib/6to5/transformation/modules/amd-strict.js
@@ -0,0 +1,3 @@
+"use strict";
+
+module.exports = require("./_strict")(require("./amd"));
diff --git a/lib/6to5/transformation/modules/amd.js b/lib/6to5/transformation/modules/amd.js
index 88b78bed69..a4d102f210 100644
--- a/lib/6to5/transformation/modules/amd.js
+++ b/lib/6to5/transformation/modules/amd.js
@@ -99,7 +99,7 @@ AMDFormatter.prototype.importSpecifier = function (specifier, node, nodes) {
 };
 
 AMDFormatter.prototype.exportDeclaration = function (node) {
-  if (node.default && !this.noInteropRequire && !this.hasNonDefaultExports) {
+  if (this.doDefaultExportInterop(node)) {
     this.passModuleArg = true;
   }
 
diff --git a/lib/6to5/transformation/modules/common-strict.js b/lib/6to5/transformation/modules/common-strict.js
new file mode 100644
index 0000000000..bb7b5c944c
--- /dev/null
+++ b/lib/6to5/transformation/modules/common-strict.js
@@ -0,0 +1,3 @@
+"use strict";
+
+module.exports = require("./_strict")(require("./common"));
diff --git a/lib/6to5/transformation/modules/common.js b/lib/6to5/transformation/modules/common.js
index 472a171f0b..0e0844ef54 100644
--- a/lib/6to5/transformation/modules/common.js
+++ b/lib/6to5/transformation/modules/common.js
@@ -60,8 +60,12 @@ 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 (node.default && !this.noInteropRequire && !this.hasNonDefaultExports) {
+  if (this.doDefaultExportInterop(node)) {
     var declar = node.declaration;
     var assign = util.template("exports-default-assign", {
       VALUE: this._pushStatement(declar, nodes)
diff --git a/lib/6to5/transformation/modules/system.js b/lib/6to5/transformation/modules/system.js
index 7d72df577d..b81d69a480 100644
--- a/lib/6to5/transformation/modules/system.js
+++ b/lib/6to5/transformation/modules/system.js
@@ -10,7 +10,7 @@ var t            = require("../../types");
 var _            = require("lodash");
 
 function SystemFormatter(file) {
-  this.exportIdentifier  = file.generateUidIdentifier("export");
+  this.exportIdentifier = file.generateUidIdentifier("export");
   this.noInteropRequire = true;
 
   AMDFormatter.apply(this, arguments);
diff --git a/lib/6to5/transformation/modules/umd-strict b/lib/6to5/transformation/modules/umd-strict
new file mode 100644
index 0000000000..6104513e81
--- /dev/null
+++ b/lib/6to5/transformation/modules/umd-strict
@@ -0,0 +1,3 @@
+"use strict";
+
+module.exports = require("./_strict")(require("./umd"));
diff --git a/lib/6to5/transformation/transform.js b/lib/6to5/transformation/transform.js
index b85c8485e1..43f45a3308 100644
--- a/lib/6to5/transformation/transform.js
+++ b/lib/6to5/transformation/transform.js
@@ -86,11 +86,14 @@ transform.deprecatedTransformerMap = {
 transform.transformers = object();
 
 transform.moduleFormatters = {
-  common: require("./modules/common"),
-  system: require("./modules/system"),
-  ignore: require("./modules/ignore"),
-  amd:    require("./modules/amd"),
-  umd:    require("./modules/umd")
+  commonStrict: require("./modules/common-strict"),
+  amdStrict:    require("./modules/amd-strict"),
+  umdStrict:    require("./modules/umd-strict"),
+  common:       require("./modules/common"),
+  system:       require("./modules/system"),
+  ignore:       require("./modules/ignore"),
+  amd:          require("./modules/amd"),
+  umd:          require("./modules/umd")
 };
 
 _.each({