diff --git a/package.json b/package.json
index 7fbbe85..90cd628 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "jquery.marker-animation",
-  "version": "1.4.14",
+  "version": "1.4.15",
   "description": "Marker animation jQuery plugin",
   "author": {
     "name": "Technote",
diff --git a/src/defaults.js b/src/defaults.js
index c9ff0c6..1b26526 100644
--- a/src/defaults.js
+++ b/src/defaults.js
@@ -9,5 +9,7 @@ export const SETTINGS_DEFAULTS = {
 	repeat: false,
 	stripe: false,
 	'stripe_thickness': 2,
-	cssFilter: css => css,
+	cssFilter: function(css) {
+		return css;
+	},
 };
diff --git a/src/index.js b/src/index.js
index e6a2931..3c3a181 100644
--- a/src/index.js
+++ b/src/index.js
@@ -2,6 +2,8 @@ require('jquery-inview');
 import $ from 'jquery';
 import { setup } from './setup';
 
-$.fn.markerAnimation = (...args) => {
-	return this.each(() => setup($(this), args));
+$.fn.markerAnimation = function(...args) {
+	return this.each(function() {
+		setup($(this), args);
+	});
 };