diff --git a/pace-theme-default.css b/pace-theme-default.css
index d9405a1..04907b4 100644
--- a/pace-theme-default.css
+++ b/pace-theme-default.css
@@ -1,5 +1,5 @@
 /*!
- * pace.js v1.2.3 | Default theme
+ * pace.js v1.2.4 | Default theme
  * https://github.com/CodeByZach/pace/
  * Licensed MIT © HubSpot, Inc.
  */
diff --git a/pace-theme-default.min.css b/pace-theme-default.min.css
index 287907a..7c7404e 100644
--- a/pace-theme-default.min.css
+++ b/pace-theme-default.min.css
@@ -1,5 +1,5 @@
 /*!
- * pace.js v1.2.3 | Default theme
+ * pace.js v1.2.4 | Default theme
  * https://github.com/CodeByZach/pace/
  * Licensed MIT © HubSpot, Inc.
  */
diff --git a/pace.js b/pace.js
index 2038761..0831a47 100644
--- a/pace.js
+++ b/pace.js
@@ -1,5 +1,5 @@
 /*!
- * pace.js v1.2.3
+ * pace.js v1.2.4
  * https://github.com/CodeByZach/pace/
  * Licensed MIT © HubSpot, Inc.
  */
@@ -49,7 +49,25 @@
 	cancelAnimationFrame = window.cancelAnimationFrame || window.mozCancelAnimationFrame;
 
 	addEventListener = function(obj, event, callback) {
-		return (typeof obj.addEventListener === "function" ? obj.addEventListener(event, callback, false) : void 0) || (obj["on" + event] = callback);
+		if (typeof obj.addEventListener === "function") {
+			return obj.addEventListener(event, callback, false);
+		} else {
+			return function() {
+				if (typeof obj["on" + event] !== "function" || typeof obj["on" + event].eventListeners !== "object") {
+					var eventListeners = new Events();
+					if (typeof obj["on" + event] === "function") {
+						eventListeners.on(event, obj["on" + event]);
+					}
+					obj["on" + event] = function(evt) {
+						return eventListeners.trigger(event, evt);
+					};
+					obj["on" + event].eventListeners = eventListeners;
+				} else {
+					var eventListeners = obj["on" + event].eventListeners;
+				}
+				eventListeners.on(event, callback);
+			}();
+		}
 	};
 
 	if (requestAnimationFrame == null) {
diff --git a/pace.min.js b/pace.min.js
index 40c74bd..b82e257 100644
--- a/pace.min.js
+++ b/pace.min.js
@@ -1,6 +1,6 @@
 /*!
- * pace.js v1.2.3
+ * pace.js v1.2.4
  * https://github.com/CodeByZach/pace/
  * Licensed MIT © HubSpot, Inc.
  */
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diff --git a/package-lock.json b/package-lock.json
index 874d0bd..45a2a37 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "pace-js",
-  "version": "1.2.3",
+  "version": "1.2.4",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "pace-js",
-      "version": "1.2.3",
+      "version": "1.2.4",
       "license": "MIT"
     }
   }
diff --git a/package.json b/package.json
index b6ea6c6..b412381 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pace-js",
-  "version": "1.2.3",
+  "version": "1.2.4",
   "description": "Automatically add a progress bar to your site.",
   "main": "pace.js",
   "scripts": {