diff --git a/bower.json b/bower.json
index c2ca7adb..a8832e29 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "react-modal",
-  "version": "1.8.1",
+  "version": "1.9.1",
   "homepage": "https://github.com/reactjs/react-modal",
   "authors": [
     "Ryan Florence",
diff --git a/dist/react-modal.js b/dist/react-modal.js
index 52d13201..0f7a7f53 100644
--- a/dist/react-modal.js
+++ b/dist/react-modal.js
@@ -1132,6 +1132,8 @@ return /******/ (function(modules) { // webpackBootstrap
 
 	'use strict';
 
+	var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
+
 	var React = __webpack_require__(2);
 	var div = React.DOM.div;
 	var focusManager = __webpack_require__(14);
@@ -1141,16 +1143,8 @@ return /******/ (function(modules) { // webpackBootstrap
 
 	// so that our CSS is statically analyzable
 	var CLASS_NAMES = {
-	  overlay: {
-	    base: 'ReactModal__Overlay',
-	    afterOpen: 'ReactModal__Overlay--after-open',
-	    beforeClose: 'ReactModal__Overlay--before-close'
-	  },
-	  content: {
-	    base: 'ReactModal__Content',
-	    afterOpen: 'ReactModal__Content--after-open',
-	    beforeClose: 'ReactModal__Content--before-close'
-	  }
+	  overlay: 'ReactModal__Overlay',
+	  content: 'ReactModal__Content'
 	};
 
 	var ModalPortal = module.exports = createReactClass({
@@ -1296,10 +1290,19 @@ return /******/ (function(modules) { // webpackBootstrap
 	  },
 
 	  buildClassName: function buildClassName(which, additional) {
-	    var className = CLASS_NAMES[which].base;
-	    if (this.state.afterOpen) className += ' ' + CLASS_NAMES[which].afterOpen;
-	    if (this.state.beforeClose) className += ' ' + CLASS_NAMES[which].beforeClose;
-	    return additional ? className + ' ' + additional : className;
+	    var classNames = (typeof additional === 'undefined' ? 'undefined' : _typeof(additional)) === 'object' ? additional : {
+	      base: CLASS_NAMES[which],
+	      afterOpen: CLASS_NAMES[which] + "--after-open",
+	      beforeClose: CLASS_NAMES[which] + "--before-close"
+	    };
+	    var className = classNames.base;
+	    if (this.state.afterOpen) {
+	      className += " " + classNames.afterOpen;
+	    }
+	    if (this.state.beforeClose) {
+	      className += " " + classNames.beforeClose;
+	    }
+	    return typeof additional === 'string' && additional ? [className, additional].join(" ") : className;
 	  },
 
 	  render: function render() {
diff --git a/dist/react-modal.min.js b/dist/react-modal.min.js
index 145d1f87..6cfc39e6 100644
--- a/dist/react-modal.min.js
+++ b/dist/react-modal.min.js
@@ -1,9 +1,9 @@
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Instead, make sure to clean up subscriptions and pending requests in componentWillUnmount to prevent memory leaks.",this.constructor&&this.constructor.displayName||this.name||"Component"),this.__didWarnIsMounted=!0,!!this.__isMounted}},N=function(){};return s(N.prototype,e.prototype,x),g}var i,s=n(20),a=n(21),u=n(7),c=n(8),l="mixins";i={prop:"prop",context:"context",childContext:"child context"},e.exports=r},function(e,t){/*
 	object-assign
 	(c) Sindre Sorhus
 	@license MIT
diff --git a/package.json b/package.json
index c20ffcfd..3a9284a2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-modal",
-  "version": "1.8.1",
+  "version": "1.9.1",
   "description": "Accessible modal dialog component for React.JS",
   "main": "./lib/index.js",
   "repository": {