diff --git a/src/scripts/duo.js b/src/scripts/duo.js
index e2a6d7c8d34..8b712dcf255 100644
--- a/src/scripts/duo.js
+++ b/src/scripts/duo.js
@@ -1,30 +1,18 @@
-/**
+/**
  * Duo Web SDK v2
  * Copyright 2017, Duo Security
  */
 
+var Duo;
 (function (root, factory) {
-    /*eslint-disable */
-    if (typeof define === 'function' && define.amd) {
-        // AMD. Register as an anonymous module.
-        define([], factory);
-        /*eslint-enable */
-    } else if (typeof module === 'object' && module.exports) {
-        // Node. Does not work with strict CommonJS, but
-        // only CommonJS-like environments that support module.exports,
-        // like Node.
-        module.exports = factory();
-    } else {
-        // Browser globals (root is window)
-        var Duo = factory();
-        // If the Javascript was loaded via a script tag, attempt to autoload
-        // the frame.
-        Duo._onReady(Duo.init);
-
-        // Attach Duo to the `window` object
-        root.Duo = Duo;
-    }
-}(this, function () {
+    // Browser globals (root is window)
+    var d = factory();
+    // If the Javascript was loaded via a script tag, attempt to autoload
+    // the frame.
+    d._onReady(d.init);
+    // Attach Duo to the `window` object
+    root.Duo = Duo = d;
+}(window, function () {
     var DUO_MESSAGE_FORMAT = /^(?:AUTH|ENROLL)+\|[A-Za-z0-9\+\/=]+\|[A-Za-z0-9\+\/=]+$/;
     var DUO_ERROR_FORMAT = /^ERR\|[\w\s\.\(\)]+$/;
     var DUO_OPEN_WINDOW_FORMAT = /^DUO_OPEN_WINDOW\|/;