diff --git a/lib/index.js b/lib/index.js
index 5967311..fdb550c 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -108,9 +108,9 @@ AxeBuilder.prototype.analyze = function(callback) {
 			.executeAsyncScript(function(context, options, config) {
 				/*global document, axe */
 				if (config !== null) {
-					axe.configure(config);
+					window.axe.configure(config);
 				}
-				axe.a11yCheck(context || document, options, arguments[arguments.length - 1]);
+				window.axe.a11yCheck(context || document, options, arguments[arguments.length - 1]);
 			}, context, options, config)
 			.then(callback);
 	});
diff --git a/lib/inject.js b/lib/inject.js
index 2d5af39..3f6f4d6 100644
--- a/lib/inject.js
+++ b/lib/inject.js
@@ -43,15 +43,8 @@ function findFramesAndInject(parent, script, driver) {
 module.exports = function(driver, axeSource, config, callback) {
 	axeSource = axeSource || require('axe-core').source;
 
-	var branding = {branding:{application:"webdriverjs"}};
-	var configSrc = JSON.stringify(Object.assign(branding, config || {}));
-	var script = '(function () {' +
-		'if (typeof axe === "object" && axe.version) { return; }' +
-		'var s = document.createElement("script");' +
-		// stringify so that quotes are properly escaped
-		's.innerHTML = ' + JSON.stringify(axeSource + ';' + 'axe.configure('+ configSrc +');') + ';' +
-		'document.body.appendChild(s);' +
-		'}());';
+	var configSrc = config !== null ? JSON.stringify(config) + ';' : '';
+	var script = axeSource + configSrc + 'axe.configure({branding:{application:"webdriverjs"}});';
 
 	driver
 		.switchTo().defaultContent();